1 definition by Mp900rr

Top Definition
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
by Mp900rr July 18, 2009

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