A pair of breasts that are very thin and shriveled like a string-bean. They typically droop down significantly and makes the affected woman look flat because they are so fucking thin. To avoid insulting a female with these type of tits, they can be referred to as a set of SBT's in public.
Did you see Caroline in that bathing suit? She has a nasty set of string bean tits. I bet her husband is banging a hot chick on the side with real tits and a firm ass.
by Rohja May 20, 2008