One's actions indicate one's level of stupidity (or intelligence). The phrase was popularized by the film Forrest Gump. Of course that fool backed his car into own house! Stupid is as stupid does!Stupid is as stupid does, so judge her on her actions, not your first impression.
ask a stupid question and you'll get a stupid answer
Also, ask a silly question. Your query doesn't deserve a proper answer, as in Am I hungry? ask a stupid question! One authority believes this idiom is a variant of ask me no questions and I'll tell you no fibs, which appeared in Oliver Goldsmith's play She Stoops to Conquer (1773) and was frequently repeated thereafter. [Early 1800s]
in. to become intoxicated; to make oneself alcohol or drug intoxicated. It’s been one totally screwed up week. I think I’ll just stay home tonight and get stupid.
sent. & comp. abb. Go ahead and ask your question without referring to it as stupid. There’s no such thing as a stupid question. But keep trying, you’re getting close.