Definitions by Frank N. Stien

Shotgun-soup 

When any members of a particular driver's family, friends, or school mates (including girlfriends and boyfriends) take a moist poop in the passenger seat of said driver's car.

Heather made shotgun-soup in Dave's car, causing them to break up when even bleach would not remove the smell.

See: poop shotgun burger king drive-by

Shotgun-soup by Frank N. Stien February 18, 2011