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To expel intestinal gas through the anus; break wind. (www.dictionary.com)
pwoooh man... did you let out a bum cloud?
bum cloud by Claire January 18, 2004

bumclouds 

Huge clouds of anal gas, stinking out the room. Usually directly follows excessive consumption of vege-grills, or curry.
*BRAAAAAAAAAAAAAASS!*

Haha, sniff my bumclouds!
bumclouds by Neil Bryson December 10, 2003