Flipping a bitch is making an illeagal U-turn, usually done in the middle of a street or over a double line. Often times resulting in your passengers freaking out or shitting their pants.
"When she flipped the bitch I almost shit my pants"
"Just flip a bitch, there's no cops"
When you have to pee in a movie but don’t want to miss anything, and must do the following mental equation: will the amount I have to pee cause enough discomfort to diminish my attention capacity for the remainder of the movie to an extent which is greater than the amount of the movie I would miss by making a mad dash to the restroom.
I saw Satantango last night, wonderful film but by the 5th hour I had to start doing pee calculus.