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 13, 2007
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 11, 2006
Become more brave
What? You need to man up. Do some push ups and man up, dog.
by iwill December 18, 2002
getting ready to go fight or do something daring, preparing for a tough siutaion most times a fight
Ayo we gotta box them dudes tonight
Everyone man up we gotta rumble tonight
by Chris May 16, 2004
take a shot
"lets all man up"
*everyone takes a shot*
by Geoff March 29, 2004
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