The rhythmic pulsation of the female genitalia in response to stimulation via either an external source or in some cases the mere thought of a sexual encounter. This phenomenon is usually accompanied by the excretion of bodily fluids stated colloquially as "clam chowder."
At first I didn't think Jackie was that in to me until the clam beat started up, from there on out it was like Ivar's up in the bitch.
by willywiggles April 09, 2012
The Urban Dictionary Mug
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