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Used as an exclaimation when something bad happens, in the same context as crap.
Mysterious chicken stole all of our pie!
Bum Clouds.
by SkuM001 November 27, 2003
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Huge clouds of anal gas, stinking out the room. Usually directly follows excessive consumption of vege-grills, or curry.

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