nut up

nut up

Sl. to go crazy. (See also crack up.) I knew I would nut up if I didn't quit that job. I almost nutted up at the last place I worked.
See also: nut, up

nut up

1. in. to go crazy; to go nuts. I’ve got to have a vacation soon, or I’m going to nut up.
2. and sack up in. get courage; to grow some balls. Come on, man! Nut up! Stand up for yourself! Sack up and let’s go win this game.
See also: nut, up