emergency blow 

Verb: Urgent need to have a bowel movement that is so pressing as to require one to utilize a public, and typically disgusting, restroom wihtout enough time to hold it long enough to make it home to a sanitary commode/toliet.

ORIGIN: Term from submarines where by air/balast is quickly released causing the submarine to rise rapidly- see the film Hunt for Red October

Jones had eaten mass quanites of mexican food the night before and was forced to excute an "emergency blow" at the nearest Gas Station.

emergency blow by JTH13 May 29, 2008

emergency blowout liquidation 

Originally a term for a discount furniture sales, the term was aptly and readily converted to describe a bad case of violent diarrhea.

After eating street tacos in Tijuana, Scott implores to Jef to pull over at the next gas station;

"Pull the fuck over dude, I've about to have an emergency blowout liquidation!"

Or in a more formal situation;

"Pardon me, I am about to have an EBL and ruin my tuxedo pants."

emergency blowout liquidation by Anton Berlin May 7, 2008