Why does my guy friend say he will slap my butt?

Anonymous
When we work on projects together or something happens he will say "I will slap someones butt" (referring to mine) or "I will smack your butt" if I do something wrong in the project. I know he is teasing but I notice he doesn't say it to anyone else.

Sometimes when I tease him he will say "shut up" back in a teasing way while he laughs 😂
Why does my guy friend say he will slap my butt?
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