A girl's boobs when she stuffs her bra.
Guy #1: She has nice boobs
Guy #2: No, those are paper titties
by pseudonym54563563 March 28, 2015
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Tits of a below average size. When view from side they resemble a flat paper bag.
Wow... His wife is pretty hot to bad she has paper bag titties.
by scott322 November 23, 2013
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