No, not necessarily. Some slang can be, but most slang is not.
I don' think that there is a slang word for rude.
slang for ghetto bad rude
A quim is a slang (and rude) word for a vagina
It is slang and a vulgar word
Slang word for testicles or bollocks
Rude boy is a very popular slang term. It is used to characterize someone as obnoxious, disgraceful, distasteful, and terrible. The term originated in Jamaica.
without being rude, the abbreviation fml means f**k my life in slang.
it's sort of a rude, sarcastic way of saying "you got some nerve" in Italian slang
It's rude slang for female oral sex.
It is a rude/slang way of saying a male has an erection in the morning.
It's a rude slang term meaning 'you' Only use it with your worst enemies.
Pejoritive : rude, offensive, generalizing, slang. Trash talking.