someone who says something stupid.
This usually refers to someone who says something stupid in a particular point of time. This does not necessarily mean they are
dumb, they just
said something
dumb at that time which makes them a num-nut.
Person 1: Hey man, what is the date of
fourth of July?
Person 2: You are joking right?
Person 1: ohhhh hahaha
nevermind
Person 2: gosh, your are such a num-
nut