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The obsidian piledriver is when someone gets face-down on their partner's junk and starts chomping like a dog with a bone. Then they pick them up and slam them down like a meatball on a plate.
My cousin tried the obsidian piledriver and screamed like a banshee.
My boyfriend does it every time I wear jeans.
My sister's dog tried the obsidian piledriver on her brother and got kicked out of the house.