the clever, muscular contractions of the vagina that a woman who is an awesome fuck can effect. A squeezing, rippling sensation is felt on the penis, usually resulting in gasping and moaning from the lucky gent, and sometimes, uncontrollable jizzing and mumbled apologies.
"Oh my god, Claire totally sent me over the edge with her gash dance"

"Ever had a gash dance?"
by MagickDio February 04, 2010

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