in. to go crazy; to go nuts. : I've got to have a vacation soon, or I'm going to nut up.
in. and sack up. get courage; to grow some balls. : Come on, man! Nut up! Stand up for yourself! , Sack up and let's go win this game.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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