Somebody who believes that they can multitask, but in attempting many different endeavors, fails at all or most of them. A failed polymath. An incompetent, wannabe rennaissance man.
"Dude thinks he's the jack of all trades. He screwed up the math on the cash register, he can't speak spanish for shit, and after he tried to tune up my car, I had to take it in and spend $200 bucks before it would start again. He's the jackoff of all trades."
by Hank the Monster October 18, 2009
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