An extremely loose, gaping female vagina. Once your in past the lips of a cavern crotch, there is very little feeling or contact between the penis and the inner walls and is akin to being in a giant empty cave.
Roger dumped his girlfriend Sheila after he pounded her the first time and discovered she had a cavern crotch and felt nothing.
by Eaton Holgoode November 24, 2015
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