dumb shit

and shit

Used after one or more listed objects, attributes or processes to indicate additional others.

beat the shit out of

To beat (someone) severely.

does the Pope shit in the woods

Obviously! Rhetorical question in response to a question where the answer is an emphatic yes.

don't shit where you eat

One should not cause trouble in places, groups, or situations that one holds as important or necessary to one's happiness or well-being.

dumb as a post

Utterly mute; lacking the ability to speak.

dumb down

To convey some subject matter in simple terms, avoiding technical or academic language, especially in a way that is considered condescending.

dumb luck

pure chance; luck

eat shit

An expression of discontent or aggravation to another party.