1. A bra.
2. Someone with two, very large and round foreheads that need to be contained within a bra or else the two foreheads will flap down and cover the persons eyes making them blind or they will flap over the persons mouth and suffocate them.
Person A: Did you almost die last night?
Person B: Yeah. I'm a tit bag you see, and i forget to wear my bra.
The female version of the "tee bag."
When a woman places her breasts on another persons face when they are sleeping or passed out.
Used to degrade the other person and or declare ownage over another person.
Huge boobs that attract one's eye, only to find out that without a wonder bra they deflate and hang to her belly. Usually found on women with multiple kids.