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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
bum rat by tomthebomb November 19, 2007
Related Words
Someone who doesn't join the discord VC
Why is James being such a Bum Rat, just join the VC dammit
Bum Rat by klwpolar April 21, 2021
Someone who doesnt join the Discord vc
Oh man why is James being such a Bum Rat
Bum Rat by klwpolar April 23, 2021
a sneaky snitch with no redeaming qualities
a rat bum is like a junkie thief that will not gain anything to help themselves in the future
rat bum by mattie rolls December 15, 2008
A rat that lives in the anus of every living being. They have extreamly large testicles which protrude from their underarms, and under developed legs, which causes them to walk on their enormous butt cheeks. A bumrat will happily eat the sharp bits in your poo and dance to dirty 70's disco music. If your bumrat dies, you die.
The french in the 100 years war fired their bumrats at the ememy, not realizing how vunerable they were when their bumrats were slain.
bumrat by Dicksmoker April 21, 2008