The description of an a-cup bosom on a svelte woman.
The nonexistent mammary glands on a scrawny woman.
e.g. Olive Oyl, Calista Flockhart, Lara Flynn Boyle
Guy #2: Yeah she was... too bad she had NORs!"
Guy #1: Yeah man....I know what you mean..
Guy #2: No, I liked Thora Birch's sweater cows instead!
'Nor' is practically the best at sports!