stupid, out of one's mind
You wanna challenge Mike Tyson to a bare-knuckled round of fisticuffs? Whaddaya, fuckin stoonad?
by weave November 8, 2003
An idiot. Doesn't know what they are doing.
Deb called Jackie a stunad cause she thought that an action figure was a doll.
by debthehead March 11, 2021