Top Definition
"O" clamp or "Orgasm Clamp" is a term used to describe the action when a woman orgasms so visciously that she siezes up & clamps her legs together so tightly she forces the penis out temporarily. "O" clamp usually lasts only a few seconds, but can be very frustrating when you are doing the deed & almost there yourself when she gets selfish & forces you to wait on deck.
I was givin' it to Julie last night & about to blow when she pulled the O clamp on me & I accidentally splooged on her brand new jacket.
by lift-ticket July 29, 2006

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