Twobacker
A girl whose breats are very small. The overall appearance is one of a person who posses two backs on the upper torso.
Hey check that chick out over there she is stunning, shame she is a twobacker.
Hey dude I felt like a necrophiliac when I was doing Sarah last night she was all ribs, a real twobacker
Hey dude I felt like a necrophiliac when I was doing Sarah last night she was all ribs, a real twobacker
twoback
A "twoback" is a woman with no visibly protruding breasts. See also: "flat as a board."
Lucy the twoback rarely goes on second dates.
"Is that a stop sign or a twoback?"
"Is that a stop sign or a twoback?"