when someone has got their head shoved so far up their ass that they are wearing their bum as a beanie.
(guy is parked at a green light)
driver behind - (beeps horn) stop wearing your bum beanie!
by natnatnat_ April 14, 2008
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A boy who is beyond the nexus of ''fat'' or ''obese'' and has a strange appearance mehbeh a mole or a Wanna be Justin Bieber. It's basically a fat person Insult Directed at the size of an ass.
HAY HO. -Throws stones at person- HAY LOOK EVERYBODY ITZ A BEANIE BUM!!!
by Culleim November 27, 2010
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