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1.
To back out of something in an especially weak and wimpish manner.
Guy1: "Hey, yo' still coming to the pub tonight? We'll do a gallon and then have a curry!"
Guy2: "I can't now, I've got some letters to write and then I have to wash my hair."
Guy1: "That is a total wimp out bro."
by Pedrosa von Beagle April 07, 2006