A phrase used to encourage someone to either be more courageous or put in more effort. It is particularly useful when sarcastically directed towards someone you do not genuinely want to do better, though this is not the only use for it.
"That player just missed his second open lay up! Yo, NUT THE FUCK UP!"
"I really like that girl over there, but I'm too scared to talk to her..." "Bro, NUT THE FUCK UP!"
by Just_some_dud3 January 21, 2020
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A not so typical picture of a dick taOR from approximately knee height (easier to take with longer arms or while squatting) angled in the upward direction in order to showcase both the nuts and dick. Be sure to have an erect dick or run the risk of appearing to simply have three nuts. Be sure to avoid anus, but if not possible, be sure to cover with emoji.
Women love surprise nut-updick pics! OR
Did you get his nut-up dick pic?! What a great angle!
by Hahaballs February 13, 2021
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Squirrel for: Taking up arms (i.e. getting ready to battle).

First coined in the Sears Commercial 'Squirrel Revolt'.
(Man walks in with wife to display a bunch of squirrels cutting coupons for them)
(Head Squirrel flips table)

Squirrel: We're tired of you humans and your tyranny! Nut Up my Brothers!

(Squirrels proceed to attack the humans and vandalize their property)
by My pseudonym is already in use October 24, 2013
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P1: "Jenny told me I can enter her backdoor dude"
P2: "Oh nice dude"
P1: "Nut up at the night of my life!"
by lizardkid September 11, 2018
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kurupt says that line not snoop dogg you stupid wigger
tools like rick d should shut up and swallow a nut up
by nick d is gay November 17, 2004
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“Alright mate? Did you see that bird last night?”

“Yeah it was great! She was well up for it!”

Fairplay mate. Did you get your nuts up?”

“Damn straight I did! She was gagging for it man!”
by Misschilli76 January 2, 2023
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