A word that originally came from the phrase "tig ol' bitties", meaning big ol' titties, which then got shortened to bitties therefore referring to women's breasts. The word has evolved and recently can be defined as any type of women one finds attractive or wants to "get with".
Definition 1: Hey look at that chick's huge bitties.
Definition 2: -Let's do something tonight. How about we call up some bitties.
-Damn, Look at that group of bitties over there, we better fuck that shit.