sometime titties

Sometime titties are the effect that some girl's possess when it seems like some days their titties are "scrumptious" and supplemental, but then on other days the titties are unnoticed and hidden. Hence, sometime titties.

Boy1: Dang man.. I coulda sworn shawty had some D's the other day.. what happened??
Boy2: Man you know she got them sometime titties.! One day they D's.. The next they poof.. gone!