to take one for the team, against most odds, to guard closely (in athletic contests) commonly yelled at Ultimate Frisbee games
Yo Bill, nut up and be my wingman tonite

Nut up on that girl, she's been owning you all day
by Texas August 29, 2004
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It means that you either gotta whip your dick out, nut it up, and get your shit done, or stop talking, sit down, and keep quiet.
Person 1: My throat hurts really bad this morning, but I won’t complain. You know what they say, nut up or shut up.
by PastelPearlie November 11, 2017
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To "get high" or alter one's state of mind with drugs or alcohol.
I needs to nut up tonight. I be off tomorrow fo snizzle!
I'm bout to nut up punk.
by tmofft January 24, 2005
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n. - an unfavorable or adverse situation
My teacher gave us detention - yo, that's the nut-up!
by "Cool Aaron" Taylor October 26, 2007
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Neither walking your talk or being silent. Just simply being able to walk your talk but choosing not to talk about it
Grandma was listening to young guapa talk about how he made 7 figures in 1 year, Grandpa said “NUT UP AND SHUT UP, NIGGA no one gives a dayum about that shit mothafucka”. Young Guapa proceeded to ask why and grandma continued with “Because we got trillions from our investment account but you don’t hear us talking about it because we stay humble my g, stay bussin and silent my nigga”.
by GiganticButtfest October 15, 2021
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Time to grow some ball's like a man, or back down like a pussy
man pussy bitch Bob- man Im afraid to ask that chick out.
Me- it's time to nut up or shut up.
by Richhomienyquan October 30, 2016
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Person 1: "I'm scared to go into the basement"
Person 2: "Well it's time to nut up or shut up"
by YourBoiCrip July 7, 2023
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