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One of the various phrases used to describe the act in which a woman rubs her vulva against her partner's body for the purpose of sexual pleasure. In this case, an Oyster Clamp occurs when the lips are sticking due to the lack of lubrication and are firmly pressed together so that they become interlocked or "clamped."

see also:
We were rubbing our pussies together so hard that we gave ourselves an Oyster Clamp.
by Awesome Jassim January 16, 2017
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