Numnuts or num-nuts is a slang term that is used to depict someone who is a constant source of trouble. Usually an individual who screws up, or constant makes mistakes. Someone who botches a job, event, or situation.
"Good job, numnuts!"
-Or-
"You guys are a bunch of #%^&!$$ numnuts! Hit the ground and give me 50!" (a drill sergeant to his platoon of Army trainees.
Numnut (n)This term is usually used to describe one of little intelligence or thought. It originates from the term numb nut meaning that ones nut, or head in this case, is numb i.e. the numnut has little to no activityin the head.
An dumb person or bumbling idiot. "Num-" refers to the term "numb", describing a person's general feelings/attitude towards people.
-used as a non-offensive, yet funny insult