stupid is as stupid does

Stupid is as stupid does is a phrase that was first made popular in the movie Forrest Gump and continues to be a cliche today. The meaning of this phrase is that the things your do and your actions are what make you look or seem stupid, not your intelligence or lack thereof. Even someone who scores low on intellectual tests isnt necessarily stupid; but someone with a high IQ can be stupid through their unintelligible actions.