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A mark or "stain" left on someone's body after being slapped or "necked".
*Friend gets slapped*, "Oooh you got a slap stain!"
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