Breasts that are so ugly that the woman who was cursed with them should become a nun so that no man will have to look at them.
Jen's boobs look like a pair of saggy bags with stretchmarks with the ends of salamis glued to them, classic nun tits.
by DingoDongo February 12, 2009
To describe something as completely useless. Derived from the fact that nuns do not have children, nor do they have sex, both of which are the main functions of breasts.
by biffboy April 9, 2009