Definitions by OriginalBildo

dirty boxcar 

When you're alone in and elevator and blow a smelly fart just as you're about to exit, leaving the smell trapped inside by the closing doors to assault the olfactory senses of the next travelers who enter the elevator.

"Oh man, somebody dropped a dirty boxcar in here before we got on!"

dirty boxcar by OriginalBildo April 28, 2010