Used as an exclaimation when something bad happens, in the same context as crap.
Mysterious chicken stole all of our pie!
Bum Clouds.
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Used in exsasperation
"He stole my car! Bum clouds!"
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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?
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