A term for describing a person of low intelligence or social aptitude. An idiot, wally, or, in its derived sense, a cretin.
Someone who makes stupid mistakes, or comes out with foolish statements or questions.
"Are you going to the party tomorrow?"
"What? That was last night, ya cretmeister!"
"You ever listen to that show, The Absolute Peach?"
"Yeah, that Joe's a right cretmeister!"