1 definition by joyle

Top Definition
When a man is being a little sissy boy blaming others for his problems and lying about the truth.

Action verb: To Start acting like a real man.
Dude, you need to Manup to the truth and accept responsibility for your actions.
#man-up #cowboy-up #act like a man #wussy boy #sissy boy
by joyle March 27, 2008
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