Top Definition
aka SBM, when you think you are just going to the bathroom to take a piss, and you unexpectedly have the urge to poop.
"Dude, what took you so long to piss? Did you fall in?!"

"Nah man, I had a Surprise Bowel Movement."
by Rabadina November 08, 2008
8 Words related to Surprise Bowel Movement

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