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."
Mike: "Yeah, he steals everything I do."
Greg: "Fucking social dementor."
by the G-Bear February 24, 2014
An extreme case of Social Dementorism in which the loser sucks up another person's entire lifestyle, from wardrobe to basic personality traits
Greg: "Whoa, that kid completely stole every aspect of your being!"
Mike: "I know! He performed the dreaded Social Dementor's Kiss."
Greg: "Yeah either that, or he wants to fuck you real bad."
Mike: "True... True."
Mike: "I know! He performed the dreaded Social Dementor's Kiss."
Greg: "Yeah either that, or he wants to fuck you real bad."
Mike: "True... True."
by the G-Bear February 24, 2014