To become tougher, or more manly.
"Damn nigga, yo ass need to man up!"
"I think it's time for someone to man up!"
"We love to get drunk, go the bar, and find the toughest son of a bitch in there and see how tough he really is...see if he can MAN UP!"
by TST November 12, 2006
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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 12, 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 20, 2010
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Step one: Check if your balls are still attached.
Step two: They are? Good.
Step three: Check again. Odds are you're drunk.
Step four: Still there? Awesome. Then just Do It.
"I dunno, that guy's pretty huge, I think he might even have a hundred pounds on me. Are you sure I can take him?"
"Of course, man. Now, what the hell are you waiting for? Man up, and take that fat bastard Bubba down!"
by Dropkick November 19, 2005
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Sticky Fingaz's song that was featured on the video game Def Jam: Fight For New York
That song is Hot New Shit.
by wcgold December 26, 2005
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To sqaure up prior to thumpin'
To prepare yourself to encounter your opponent just prior to combatant engagment
A: Sup den ni**a?

B: whatever you might want it to be ni**a

A: man up den

B: you ain tryna see me
by M. Du May 10, 2005
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adv; mans up, manning up, manned up.

1.To man up: Its time for you to man up for your baby girl.

2.To be manning up: he manned up once he saw the one.

3.To have manned up: he manned up for his son in the past.
1.Did he man-up, or fess-up to his moma!?

2.Today I might be manning-up, for class.
3.Get up to my level of happiness, before you leave.
by RB. 865. January 26, 2014
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