a fart (or any other form of gassy production)that is not able to exit the body. it can be easily exposed of by squishing the butt cheeks together. the stank-hanger should slide out unnoticed. stank-hangers are usially silent and have no potent stench. they usially occur before a large bowel movement.
to a group of friends: guys hold on i gotta stop and release my stank-hanger.