Alternatives to "kick your a**" [closed]
If you want to soften it as much as possible, you could say
I'm going to kick your behind.
From NOAD:
behind noun
1 informal the buttocks: sitting on her behind.
Still softer would be
derrière |ˌderēˈe(ə)r|
noun informal
euphemistic term for a person's buttocks.
If you want to go softer than that, perhaps you had better leave off altogether the notion of "kicking" anything.
There are probably a million equivalent expressions covering all levels of rudeness.
Kicking your butt
is the closest equivalent I can think of without using "ass"