something that you would kill a bum for
1. dude that car is such a bum killer

2. That girl is so hot shes such a bum killer
by Daija June 1, 2005
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killer bum is a game played by shaking your bum and chasing unsuspecting victims while running backwards and screaming KILLER BUM KILLER BUM!
LOOK OUT- it's killer bum!
by Candybum April 16, 2010
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