Gooch Pinch

a; A gooch pinch happens while wearing comfortable jeans with loose underwear or, more painfully, no underwear, and attempting to sit on a leather or suede(unforgiving) couch and feeling a slight pinch between your balls and asshole whilst you sit down.
b; While participating in oral sex the giver causes the receiver much pain after pinching the skin between the sex organ and the asshole with their fingers or teeth.