What's the pejorative term for your people?

[The Great Zedong Dynasty]

What's the miss offensive word to ever call your people and also is it really degrading or just a little offensive?

NO real slurs are allowed!

[The Great Zedong Dynasty]

Menbajak, short for Menjalankan bajingan kecil meaning running little bastards by the Malaysian Fascist Empire

[Confederate Ramenia]

Bottom ramens

[Longweather]

Let's see, "aristo" is rather pejorative to the nobility. Other than that, mocking a person's title is considered pejorative.

Commoners are often called "lowborn" by the nobility to show disdain for the "crass" and untitled majority of the Empire.

Interestingly, both the nobility and commoners have one common pejorative term that they use. "Bootlicker" is used to describe a person that is so lowly and despicable that they would do anything to curry favor without hesitation. Duels and the secret "wars" the nobility occasionally run have been started just by calling one a "bootlicker."

[Fonidia and Osteyon]

Applying to the whole Union:
Tiddie used to be offensive, but it lost it's offensiveness through the 20th century, and it's used by Ostidians themselves frequently.
Ostoe can be offensive depending on if you're actually using it as an insult or not. Still, you should avoid using it when talking to strangers, since it's a very informal word.
On the other hand, the worst slur is "Hardyskull", which refers to the Hardy surname, the most common in the Union, and is also a play on the phrase "being hardheaded"; (Ostidians are sometimes stereotyped as people who will not admit being wrong, even in the stupidest situations). The slur can get worse if you change the word "skull" and say a stronger one, like "Hardyf---" or "Hardyc---"

Within the Union or referring to certain regions:
Shrimpers is a moderately offensive slur in the Eastern Archipelago (known as the East Isles). This is because one of the region's most historically important export have been shrimps and prawns, which are an important part of the Union's cuisine. It's offensive because it's considered to be stereotyping them.
Yonckies is a very offensive slur for people from Osteyon, while Fondicks is a very offensive one for those from Fonidia.

And although it's not a racial one, there's also Ballhead. Ballhead is a very offensive insult for most Ostidian football fans; football is HUGE in the Union and fans are... well... considerably more passionate about the sports than fans from surrounding countries. A football fan may call another one a Ballhead, but only if they support the same team. Calling a fan from another team a Ballhead is an invitation for him/her to kick you in the groin. And if you don't like football, you must never call a fan a Ballhead unless you don't want to keep your teeth inside your mouth. It's such a bad insult that actual ball heads (http://en.wikipedia.org/wiki/Ball_head) are called "rotary stands" instead.

[Ironbarrow]

Metorian, and it's offensive as hell. It will get you shot; quickly.

[Esrael]

Regular jewish pejoratives, such as Kike, Big-nose, Greedbergs, very offensive mind you

[Grand Britannia]

Twats, Teafucks, Sheepshagger(south), Gay.

[Heicliffe]

Lofties, Cliffhuggers, and Mountainmen are a few examples of slurs against Heicliffians. Most are said and received with jest, although tone, present company, and situation are more of a determination if hostility were meant rather than the words themselves.

[New Kvenland]

Icicles, Emane-koerad (Rough Estonian for "b*tch"); Icicle will get a laugh, maybe a dirty look. Emane-koerad will get you slews of dirty looks, a fight, quite likely, and possibly even being shot.

[Ammerinia]

"Cap Head" or "Cap tête" in French, is the english pejorative term for Ammerinians. Short for Rich, Fat, Smartass capitalists. It refers to the wealth and luxury that Ammerinians live in and their reputation for being well-educated. Though it is still considered mildly offensive today, it is sometimes used jokingly among citizens themselves.

[Togeria]

indu-men

[Snakelan]

An offensive term mostly used by Anti-Snakelanese People Racists and Fascists in "Snakeskins," due to Snakelan's animal being the snake. Another term is "Kobra-pizdas," meaning "CobraC**ts." The first term is not used a-lot, But the second term is used by Anti-Snakelan Racists and Fascists, And thus is very offensive to Snakelanese people. There has even been fist-fights when one of the two parties was insulted with this term.

[Icrum]

Traitor.

[The Great Island of Sodor]

Scared-y engine, first used by Thomas the Train against Percy the Train. Although Thomas later apologized, the slur is still used by supporters of Thomas against the green party.

[Cardassian Empire]

Spoonheads.

[Zhouran]

Ocean Snatchers, a pejorative term for Zhouranese people. It was given that name because of Zhouran's ancient hegemony on the Pacific Ocean, as well as the fact that Zhouranese warships and submarines currently sail around the Pacific.

[Saurisisia]

Lizards
Fossils
Comet Fodder
Scale Bags
Tail Fuckers
Sauris

Of course, the Comet Fodder term is considered particularly offensive given that comets and asteroids are considered by Saurians as passages to the afterlife.

[New Brasilia]

Last week, a foreign tourist visiting New Brasilia had the audacity to call us a "third-world commie shithole". Don't worry, he was later deported and banned from the nation.

[Acharastan]

Gilashypo.

It't a word meaning the ultimate traitor or ultimate evil. Don't call us that.

[Zeganas]

Well there's a few words for our native wolf humanoid race, and those are popper, glowstick, and fluff trash. There has been increased racial tension in the past year in my nation.

[Themiclesia]

Since we don't conceive ourselves as one nation or one people, there are no pejorative terms in general for Theiknes. (Declined: sing. nom. Then, gen. Thes, dat. Thiknei, acc. Theika, voc. Theis; pl. Theiknes, Thiknon, Thikamos, Theikas, Theiknes.)

[Erwa]

Erwans are sometimes refferred as the reds because of the ruling party's ideology, however, this is only considered as a mild-offensive term.

Erwie, guillotiner, and whiteblood are really offensive.

[Cora II]

'Grunts'

but only if called by foreigners.

[National Socialist Korea]

Shiteaters, credits to this traditional dish.

Also, Uglies, stemming from the fact that "Uguria" sounds a lot like "Uglia".