rocking horse shit

and shit

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

beat a dead horse

To persist or continue far beyond any purpose, interest or reason.

beat the shit out of

To beat (someone) severely.

charley horse

A muscle cramp, usually a strong one, in the thigh, leg, arm, or core.

close the stable door after the horse has bolted

To attempt to prevent a problem that has already occurred; to design and implement a preventive mechanism that is too late (after the first failure instead of before).

dark horse

Someone who possesses talents or favorable characteristics that are not known or expected by others.

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.