Why does my guy friend slap my butt?!

Anonymous
We have the same group of friends so when we all go on a night out, he's there.

Anyway, I do catch him looking at me and when I walk past him he'll slap my butt and then smile or laugh after? Why does he do this? and it's only to me.

I don't really find it offensive either because I've known him for years and he's always been a flirty type of guy, I'm just curious as to why he does it.
Why does my guy friend slap my butt?!
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