Top definition
When someone pretends to borrow a buck or more in dollar bills and then runs off with it leaving the victim pennyless.
Sarah: Oh look, the Salvation Army is doing donations for the Christmas season.

Lenny: No stupid, it's a bum on a buck run.
(background: Woo-hoo! I'm rich! Goodbye sucker, hello Absolut!)
by Jose Gomez October 05, 2006
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