The situation where sexual relations in an automobile are interupted by a homeless person asking for money.
Diaz: What's wrong, Giringo?
Dave Diamond: No sexo, I got busted by the bum!
by sextoaster December 12, 2004
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Seriously ugly.
From Australia.
Aussies and Brits often use the word bum instead of arse (ass)

So it stands to reason that a busted bum would be a lot more unattractive than one that isn't busted.
"Check out this chick, she's got a face like a busted bum!"
by Pastor Flagon March 15, 2014
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