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The incorrect spelling/understanding of Mick Jagger, the singer of the Rolling Stones. This is the name that people who don't know shit about the Stones call the lead singer.
"Hey man, did you see McJagger in concert?"
"Uh, you mean Mick Jagger right?"
"Shit, I've been saying it wrong this whole time?"
by Henry Wadsworth Longpants January 19, 2010