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