A stain left on your hand after jerking off.
That guy over there had an Irish stain on his hand after he came out of the bathroom.
The mark left after getting necked or slapped on your skin.
Angie: "Honey, do these jeans make my butt look big?"
Bill: "Yes"
Angie: "You better rethink your answer before I put a slap stain on yo face
Is when you leave a steamy shit on the ground that then gets kicked which leaves a greasy outline of said stool.
Dale had a turd ball dribble out his pant leg that left quite the beef stain on the ground.
"Nice thot stains...did you get those last night?"
"I spy some thot stains on your neck..."
"Troy gave me thot stains and now I need to cover them from my mom"
"Can I use that scarf? I need to cover my thot stains"
The remorse one feels upon soiling another's linens with bodily excretions.
The night was going pretty well, until Anthony angered Melanie by ejaculating on her new Egyptian cotton sheets. Now he is feeling stain-pain.
NOTE: Not to be confused with Staind-pain, the extreme inner turmoil one experiences while listening to Break the Cycle.
When you masturbate in bed and you leave it on the sheets and your girlfriend or wife rolls over on it and gets pregnant.
He's not dumb, he's just a stain baby.
When a guy has sex two days in a row without showering.
Yeah man, had a great week-end with her, I even re-stained the deck.