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.

A phrase to describe someone who is cognitively degenerating. Synonym of "going off the deep end". Can have varying degrees of severity.

Reference to the song "Hey You" by Pink Floyd. The line "and the worms ate into his brain" makes no sense in an otherwise linear and literal narration throughout the lyrics.

silly person / idiot

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 activity in the head.

1. A total idiot, with the mental capacity of a duck
2. Someone who got hit in the nuts so hard they lost all feeling in their nuts

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

a term used to describe someone who is being stupid, retarded, or doing uncalled for things.