Top Definition
somebody who manages to be a bigger loser/tool than a Reichenberg.. if it is humanly possible. It originated from the greek/latin term "mcbar" and from a word we all know today as "tool." It was originally called a; toolmcbarwin, but now is known for short... a mcbarwin!!!
mitchell was being a big mcbarwin because when he was bored he called and didn't stop until they invited him over. they didn't. so than cried and didn't have anyone else to go to so he just stayed home.
by hello my name is joe :) April 05, 2009

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