Flip a bitch

An old biker term for making a U-turn. So named because the person in the "bitch" position of the motorcycle might flip out of their seat during the maneuver.

On their way to Sturgis, the motorcycle gang drove too far North on I-90 so the whole gang had to flip a bitch at Whitewood and Buddy's old lady flew off the back of his chopper and smacked her face on a billboard.