The act of switching from anal sex to going down on a woman in 2 seconds.
Exemplified in www.niggaflip.com
I was banging this girl in the ass, I nigga flipped her and started eating her out!
When a white girl is naked and she goes on top of a naked black man, and he flips her over his head while his penis is inside of her ass.
When you Nigga Flip someone, it hurts the girls butthole =/