The name you would give to someone who clearly and directly ruins a moment for you and causes you to feel emotional pain as if you were being bitten or "crunched" in the buttocks or "ass"
You ass-crunch, I was going... to fuck her until you told me she had crabs; now I'll neverget laid
term used to describe carelessly doggystyling the shit out of someone and your wanker slams right into an ass cheek about breaking your rock hard cock in half...after which you remain in the fetal postion, crying like a little girl for hours