poppin a titty
When one or both of a females breasts come out by accident
Hey check that bitch out! Shes poppin a titty!
poppin titties
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
Girl: Ewwww
Mary Poppins Titties
Titties that are perfect in everyway.
Damn, that girl I went home with last night had Mary Poppins titties!