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The crust that forms on the crotch area of a woman's underwear after she has worn it all day, usually due to the drying of normal vaginal mucous secretions.
Girl A: "I wasn't going to change my underwear before my date tonight, but when I went to the bathroom I saw it had a layer of cunt toast on it."

Girl B: "That's fucking gross don't tell me that shit."
by Captain Katherine Janeway September 21, 2013
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