Either walk your talk and prove your worth or toughness, or keep your pie hole shut and get the hell outta town.
Keep running your mouth...either rise to the occasion and let me thrash your ass when I grab that stack of dimes you call a neck, or refrain from further trash talk. Take your pick!!
by weave March 25, 2003
either pull your dick out and ejaculate and go do you task or shut up
Frank: Dude i gonna ask out debbi

Ron: Dude, nut up or shut up
by lost shadow kid April 1, 2010
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
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
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