영어로 키배뜰 때 할만한 욕들 좀 알려주세요.
Teach me some bad words or slangs in English that I can use in the chatting.

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i hope this doesn't make me banned, ok i'll let you know some swear words.
here's a curse word that is usually seen as 'too offensive' in america, so we only use it casually in australia and the uk. - 'cunt' (so i think it'll have a good effect if you're using it on americans)
dickhead, asshole, bitch, fucking idiot, oompa loompa lookin ass, son of a bitch, bastard, wanker, shithead, incel, freak

just add 'ugly' in front of any of these swear words to make it better as well.
or insult something else about them. if their hair looks greasy call them a lanky drowned rat.

la kinda cringy slang that's used lately online (by teenagers) is 'sussy baka' which refers to among us - where people are called 'suspicious' - plus the japanese word 'baka.' so you can use this as a joke but i don't know how many people will find this cringe. i think it's funny to use ironically.