What does it mean if a guy slaps or pokes your butt?

I was at my locker getting my things together and he just came up to me and poked my butt. Then at the end of the day he slap it. Ever since he's been slapping my butt or poking it. He's very nice, best guy in the world i have ever met. He's the best, he's there for me when i need him. Before he would garb my hand, and sometimes we hug. In my opinion, i really don't mind at all. Actually sometimes i do it back to him, and he gets chessey** sorry i don't know how to spell it >_<.
What does it mean if a guy slaps or pokes your butt?
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