The crusty organic substance accumulated on an unclean vagina. Cunt Lint is developed when a woman goes too long without bathing or douching. Effects are worse if woman is dry or post menopausal. Cunt Lint is closely related to Belly Button Lint.
Guy: Damn Gloria, you have to much Cunt Lint down there, your vajay feels like moist sandpaper.
Gloria: I don't believe in bathing, I like my own natural scent :-)