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A term used for someone who thinks that they're the shit but they actually aren't.
Student A: Hey, did you see that kid at lunch the other day?
Student B: The one that was acting like he owned the place?
Student A: Yeah, I think he was exhibiting symptoms of Beigelism
Student B: Yeah definitely.
via giphy
by ThatOneGuy5673 September 27, 2017
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