Any other girls do this?

Its cool. Its playful. Nothing wrong with it. Your a flirt. But that's a good thing.

Uh, no I'd never do that. And frankly I'd be pretty pissed if my guy was doing that to me.

its not weird I just think that you shouldn't do it a lot or everyday just walk up to him in give him a hug or something not something that probably his grandparents would do.

if need any advice send back

everyone once in while its okay to playfully slap him.
but not to hard, you wouldn't want him to think you are "abusive". if you do it to often or to hard he maybe a little flinchy, and the pinching thing. yea, that's what grandma's do. :]