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1.
a person who makes ostentatious pretenses to knowledge or skills and who will threaten physical violence upon being exposed
Guy 1: Man, Danny doesn't know crap about literature, but that's all he talks about--especially when he's trying to impress people at parties.

Guy 2: Well, I'd keep those comments to myself if I were you. If you expose him, he'll make a scene and maybe even threaten your life in front of everyone. He's one tough charlatan, all right.
by Danny is my enemy May 12, 2010