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the process in which the vagina in stimulation produces its own lubricant(or marinade) and begins a pull on the shaft of the penis...

some say scientifically this is a reaction to pull semen closer to the uterus......

also the constriction of the vaginal walls mimicing a swallowing sensation
Nic watched as i nailed that chick so hard she got all bothered and caused an upsuck so hard on my pulled all the skin up to the head of my dick to where i didnt have enough skin left to close my eyes.

The upsuck of that chicks ass was like someone drinking out of a garden hose in the summer.
by jere from smackjab April 19, 2008
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