nut out

1. slang To discover, through careful consideration, deliberation, or investigation, the solution to something. In this usage, "nut" is slang for one's head or brain. A noun or pronoun can be used between "nut" and "out." Each of us has hit the same stumbling block in the assignment, so we're going to get together this weekend and nut it out together.

2. slang To begin acting in a crazy, erratic, or deranged manner, especially due to extreme anger. In this usage, "nut" is a derogatory slang term meaning "a crazy person." A noun or pronoun can be used between "nut" and "out." Tom totally nutted out after he found out his wife had been cheating on him.