A pair of breast that are only large due to the womans very large girth... If she dropped some lbs than so would the breast... thus making them sugar breasts (i.e. her dependence on sugar)
That bitch has a massive set of sugar titties.
Term of endearment. Sometimes said by female to male, as a means of arousing and emasculating simultaneously.
Boy: Making love to you was spectacular tonight baby.
Girl: Yeah, it was whatev... goodnight sugar titties