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A person who sucks up behaviors, speech, or styles that they think are cool or funny from those around him/her or in the media and adopts them as his/her own personality like a dementor eating someone's soul. This person is trying to be accepted, but most likely comes off as a douchebag, try hard, piece of shit.
Greg: "Did that dude just say your line, bro?"
Mike: "Yeah, he steals everything I do."
Greg: "Fucking social dementor."
by the G-Bear February 23, 2014
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