1)To not behave like a child and to not behave like a woman.
2)To know what masculinity is and what testosterone does.
3)To be an adult male in the truest sense of his manhood.
1)Dude is a MOMMAS BOY, dude needs to man up.
2)Dude is on estrogen, dude doesnt know how to man up.
3)Dude does not mess around, you better man up.
by Brian E.Nightingale October 14, 2007
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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 22, 2014
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To conduct one's self befitting of a man deserving of a fine piece of trim.
John C and Ralph M watched as a sniveling young punk cry like a school girl while watching his women knob down on another man. John C turned to Ralph M and stated: That mother fucker needs to MAN UP. Derived Mid 1970s NJ.
by questor1 August 7, 2011
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Said when the would be, baller is talking all the shit to get what he/she wants
Another way of being called out after action has been taken.
You want it sucka, it's time to Man up. Request or ask for what you want and see what happens.

or

Guy: Bro I put $20 on the fact J's bullshittin.

Girl: Yeah he won't do it! Says he's a bad ass baller but won't just go for it. Man up dude.
Guy: Nevermind $20. I put a 50 spot on the fact he pussies out and doesn't do it.
by wolfdog8mynutsDrnsqirl November 26, 2009
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comes from england
means to grow some balls and get on with it
can be used in most situations and the 'hack it part' is optional
patient- 'but i don't want to walk around on crutches for 6 weeks, it's really difficult and painful'

doctor- 'man up and hack it.'
by selene du coudray October 8, 2009
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To abandon the overly sensitive, healthy, monogamous traits that have become so prevalent among the modern man, and instead, embrace the booze drinking, steak eating, secretary pinching behaviors of the swinging 1960's man.
Dude, enough with the "Mommy and Me" classes! It's time to Mad Man Up and come drinking with your boys!
by prepster2009 August 9, 2009
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Something you tell someone when they need to get their butt in gear.
The good Dr. Berry walks into the room and tells the new guy, man up nancy, we've got work to do.
by Mr. Chris November 9, 2007
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