1 definition by Shiavo

Top Definition
The act of one's rectum muscles relaxing so completely that feces flows out without any effort or control devastating all in its path like an avalanche.
ohhhh bro after eating that taco I was hit with a series of shavalanches all night long.

I got so pitted I shavalanched my pants.
by Shiavo August 19, 2009

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug