When one or both of a females breasts come out by accident
Hey check that bitch out! Shes poppin a titty!
by slothslothskin January 19, 2014
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Used to describe a females breasts when they look good in the attire she is wearing.
Joel: Hey Girl you have poppin titties!!!!

Girl: Ewwww
by O.E.D. September 20, 2012
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