When dried up milk,dirt,or other debris is stuck to the woman's nipples informs a nasty crust
Billy put Rebecca's nipple in his mouth and got a mouth full of titty crust
by Coochie cutta January 3, 2016
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Crust that comes off the nipple
Your titty nipple lip crust got in my salad!
by Babydoll400 February 24, 2015
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