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Cunt Moss is the grassy substance that forms on the vagina when an old woman becomes wet, but does not engage in any sexual activity, because she's old. It also means she's dirty because cunt moss only forms when the old hag forgets to wash, and the mold and moss starts growing.
The woman is so old, and so ugly, I bet she's got cunt moss.

Dude, I was about to bone this MILF the other day, but I couldn't get over the fact that she had cunt moss! (Note, that cunt moss will never ever form on a MILF, so your friend is probably exaggerating the hotness of the old woman when he tells you this story.)
by FRAjeff May 14, 2008
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