nut-up 

n. - an unfavorable or adverse situation

My teacher gave us detention - yo, that's the nut-up!

nut-up by "Cool Aaron" Taylor November 13, 2007

nut up 

hybrid cross between "grow a pair of nuts" and "man up"

Guy 1: "Oh man, I totally wanna bang that chick over there."

Guy 2: "So nut up and do it already!"

nut up by LOVEMESOMEURBAN October 18, 2010

nut up 

suck it up, just do it, who cares

Dan, Jay and Jeff came out of the corsey and saw some hot girls. Dan and Jay said "hi!!!111oneone" and Jeff said "nut-up!" The girls drove by and flipped us off.

nut up by dFecT June 2, 2004

nut up 

(v.) To gird ones loins. Nutting up entails using one's proverbial balls or "nuts". Mainly used on the US west coast, it's the sister (brother?) term to cowboy up.

I better nut up or I'm gonna get my ass kicked in this fight.

nut up by Neilmiser May 14, 2004

Nut Up 

Verb phrase: To involve oneself in a physical altercation, to lose one's cool, or to fly off the handle. A common fixture of urban or "gangsta" vernacular. Recently popularized by a homophobic, black-clad drug-dealing NPC/pedestrian in the controversial PS2 game "Grand Theft Auto: San Andreas."

"Yo, I'm fidd'nduh nut up in a minute!!!"

Nut Up by Buddy-Rey December 18, 2005

nut up 

To suddenly go crazy with no apparent provocation. Especially true with emotional issues that have not been previously resolved but avoided.

"I was talking about waiting another year to get married, and she began to nut up on me."

nut up by CWB September 18, 2005

nut up 

To go crazy or stupid. To be extreamly fearful.

Don't nut up on me now.

nut up by F.I.D.O. July 22, 2006