What's some good comebacks if a guy slaps your ass? Funny ones. He's you're friend goofing around?

Anonymous
My friend thinks it's funny to slap my ass at school and it's fine cause he's my friend but I wanna be able to have a funny good comeback when he does it. Any suggestions?
What's some good comebacks if a guy slaps your ass? Funny ones. He's you're friend goofing around?
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