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An "O" clamp happens when a woman comes so hard she turns into a human vice grip, squishing the penis out like it owes her money. It usually only lasts a few seconds, but it feels like an eternity when you’re right there, ready to go.
She came so hard I got flung out like a kid from a slingshot.
He was about to finish when she clamped him out like a stuck door.
I was halfway done when she clamped me out like I was a bad habit.