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when a pansy-ass MAN is acting out of his job description and needs to be put into place.
"...stop acting like a little girl and man up, fool."
by Marvin June 27, 2003
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After a long night of high octane™ drinking.... the procces of hanging over occurs. To deposit these prodiougous feelings a beer or some other alcholic beverage is in order, to insure the release of the harmful intoxicating feeling.
After Timmy was drinking with high octane™ all night, he arose out of bed with a raging headache. To release the pain from his body he had a man up session and felt much better.
by GaryF August 09, 2006
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Be more brave. Step up.
Talkin' talkin' talkin' talkin' talkin' dat shit?
Talkin' talkin' talkin' talkin' talkin' dat shit?
Talkin' talkin' talkin' talkin' talkin' dat shit?
Talkin' talkin' talkin' talkin' talkin' dat shit?
Man up, muthafucka, man up.
by D-Miles September 30, 2006
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Not wanting to do something because you are too tired, scared, lazy, etc... but once you do it, you feel much better about yourself
Josh didn't want to take out the garbage, but once he decided to "man up" and do it, he felt much better about himself because his apartment didn't stink anymore
by JoshyWashy March 10, 2012
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4. It also means for a workplace, or corporation to deal with, take care of, and help those people that they have caused hurt, damage, and/or injury to.

5. It can also refer to respecting someone enough to go talk to them, apologize, do what's right when it is the right time to do so.
4. The opposite would be the company fighting you in court with expensive, fancy lawyers who's sole responsibility is to twist situations/blame and/or to lie for and protect the company or organization that harmed the person(s) sitting at the other side of the table, hurt for the rest of their life. When someone does this all for money; it's NOT manning up - it's the farthest thing from it. It's all about doing the right thing... and this is not it.

5. The boss had no idea who had dinged up the car door. But she went to her boss and told her boss that it was she that accidentally dinged up the new Porsche. She is admirable for (man up) her responsibility, and she gained a lot of credibility with her boss too. She asked for forgiveness, and all is fine & well now between them. I think it may have started a new friendship between them, just because she owned up (man up) to it.
by IrishDaddy2U April 11, 2010
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It means act like a man, but in a non-sexist way. It is not meant to be chauvinistic or disparage other groups. Similar phrases would be "be a man," "be a mensch," "be a stand-up guy" or "wake up and accept responsibility for your actions."
Judge Marilyn Milian on THE PEOPLE'S COURT occasionally uses the term "man up" in the way described above, somewhat like an earlier TV instruction of hers to "butch up your act" but not so gay-identified. She has been provoked to the "man up" remark when confronted with such clueless men as the biological father who claimed he 'wanted to be a daddy' when he in fact had not visited his son nor contributed to his support, and the man who consistently maintained he had put only a scratch on plaintiff's car when in fact all the witnesses confirmed and all the photographic evidence showed that he had done considerable damage. It would be absurd for Judge Milian to order a woman to "man up" but she has other, analogous remarks, to make to similarly witless or hypocritical women.
by al-in-chgo February 19, 2010
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