1. rude slang Literally, a mark left by excrement. We need to rip up these carpets—they're covered in shit stains from grandpa's dog. His underpants had a disgusting shitstain on them.

2. rude slang A despicable, contemptible, worthless, or inconsequential person. Sometimes written as a single word. Don't listen to a fool like him, he's just a shit stain. I'll never understand why they hired a shitstain like him to run the company. Go ahead and sue us. There's no way a little shit stain like you can beat our company in court.