The physical condition where a woman's labia minora descend below her labia majora, forming the shape of a bell. Such features are desirable for women wishing to form a cameltoe. In severe cases, a labioplasty may be required in order to allow bikinis to be worn.
Useful for pulling aside and going "Wubba-Wubba-Wubba" while yodeling into the canyon of love.
I'd post a pic of my ex-girlfriend's bell lips, but when I tried to take a photo, the camera lens shattered!