hanging turkey
When you're walking or hiking and have to pee but can't afford to stop, so you turn around and start walking backwards so that you can pee while you walk without getting pee on yourself. The maneuver is named after your exposed cock and balls resembling a turkey beak and waddle. Also called a "walking turkey" or "hanging donkey."
I had to pee during that marathon but didn't want to lose any time, so I turned around and pulled a lil' hanging turkey.