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First defined in NASIOC's Off Topic forum by Kaiser as the slow, crampy, painful, and excruciatingly long build-up of poo in one's bowels, which finally reaches a breaking point and results in a massive avalanche of crap being explosively expelled from one's ass. Hence, assalanche.
Zeke sat miserably on the toilet for 30 mins with bad stomach cramps -- a half hour cycle of cramping and loosening and cramping and loosening tearing at his abdomen. But, frustratingly, no poo was shat. He suffered wave after wave of pain...until, finally, that last little snowflake fluttered down on 500 billion tons of brown snow. The assalanche came without warning, and it was fierce. Many people in Toiletville were caught unaware and perished in a 100mph rush of furious poo.
by Zeke Brown May 23, 2007
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When an ass is so large that the definition of that ass is completely lost within the body of the individual bearing the ass. Usually best identified when the ass starts amid the fat of the back and ends at or after the knees.
Damn, I'd have hit that but I'm afraid I'd be consumed in the ensuing assalanche.
by Jezru December 11, 2007
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Word describing what happened to someone who has a really flat ass. They may have had a nice looking ass at one time, but at some point it evidently broke away and fell off for no apparent reason.
"Wow, can you believe how flat her ass is?"
"Yeah. Looks like she had an assalanche."
by Dr. Kadiddlehopper February 03, 2010
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A massively destructive wave of stupid people or bad decisions, usually in the workplace.
"I was having such a great day, then it was blotted out by an assalanche streaming down from the manager's conference room. What we in the north country call White Death."
by W2 June 18, 2008
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When a large number of attractive females enter a room.
"Daaaaaaamn son! Look out for the assalanche that's coming through that door!"
by Feralwinky November 25, 2009
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A massive bowel movement that bowels out of you much the same way an avalanche slides down a mountain destroying everything in its path.
Guy 1: Dude you blew up the toilet, what did you do in there?

Guy 2: It was an assalanche, what can i say?
by chumpfong July 15, 2009
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When you have to poop so bad, that your ass hole just opens up and the poop flows out.
Rachael had a really upset stomach today and went she finally went to poop she had and assalanche.
by Lucas N. April 26, 2007
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