Hey axl,
<< Hmm...do you mean when he's standing up, and waving his hand in front of him? He's also doing a little thrusting motion with his hips at the same time...looks to me like he's pretending to do someone doggie style, slapping her on the ass every once in awhile. :)>>
I always thoought he did this only during rap videos and was pretending to be "scratching" on a turntable...possible?