Top Definition
A woman with a very flat chest, such that it resembles her back. Only the nipples give it away.
The girl at the party was pretty, pity about her two backs.
#boobs #boobless #tits #chests #girls
af DesDDD 24. september 2007
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?"
#two backs #twobcacks #flat as a board #poorly endowed #stick figure
af snowshoesny 26. september 2009
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