1 definition by tomthebomb

Top Definition
A rat that has some how found its way in to your bum gap and has made babies..
They wiggle alot and cause some discomfort

You need to get them out by there kneck as if you grab the tail it will rip off
Dave: Some things wrigglying in my ass

Keith: You may have bum rats
by tomthebomb October 30, 2007

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