janitor widow maker 

Commonly referred to as a JWM, it involves unleashing a dump in a public bathroom so damaging that were a janitor to attempt to clean it, it would make a widow of his wife, and an orphan of his children.

A variation is the UJWM, which involves a urinal. This is a high-risk move, but a janitorial fatality is pretty much assured if successful.

Laughing, Ken passed the janitor on his way out of the bathroom, knowing his janitor widow maker was about to strike.

janitor widow maker by Nick2011 September 4, 2008