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1.
1) Someone with an enormous chest who can not clean underneath their boobs properly so a grit begins to form there. (Including man boobs)

2) Insult; referring to a person who looks unclean.
Take a look at those gritty titties on that chick.

Tell your brother to take a bath, his gritty titties are stankin' up the place.
by Steven Earps April 10, 2007