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.
When you solidify semen by freezing it into nugget shape, then insert it into a woman's anus, waiting for it to melt and leak out before being served to the man eating ass.
Person 1: Last night, my girl made me some tasty anal nutnuggets, it was great.
Person 2: Damn, I wish my girl would dare to do something more than feetshit.