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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!"
by LOVEMESOMEURBAN October 15, 2010
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Apr 2 Word of the Day
Music so good it could elicit sexual arousal.
The new We Came As Romans albums is chock full of bonerjams.
by lpvitus October 28, 2009
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2
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.
by dFecT June 02, 2004
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3
(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.
by Neilmiser May 14, 2004
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4
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!!!"
by Buddy-Rey November 07, 2005
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5
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."
by CWB August 27, 2005
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6
To go crazy or stupid. To be extreamly fearful.
Don't nut up on me now.
by F.I.D.O. July 19, 2006
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