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.
General term referring to an individual who does not amount to your expectations. Numnuts becomes numnuts when he/she/they/feman/mailman/ steps out of line. To become a numnuts is to become wiped from the map of validation.
Buddychirping nannies and tweeting aunties on dinner 11 eh? Humphrey is such a numnuts!
Laughin' Jokin' Numbnuts is the name given to LJN by James Rolfe, the Angry Video Game Nerd. James is a classic game reviewer with a low tolerance for bad games and LJN has consistently released poor titles.
I wanted to buy "Back to the Future" for the Nintendo Entertainment System until I found out it was a Laughin Jokin Numbnuts game.