paper titties 

A girl's boobs when she stuffs her bra.

Guy #1: She has nice boobs
Guy #2: No, those are paper titties

paper titties by pseudonym54563563 March 30, 2015

Paper bag titties 

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.

Paper bag titties by scott322 November 22, 2013