BTNR

The single most important thing about a breast past the A cup.

BTNR stands for "Boob To Nipple Ratio."

A girl with a large rack and small nipples is said to have a good BTNR, while one with large nipples is said to have a bad BTNR.

"Hey bro, what's the BTNR on her?"
"Sub par. The nips are like pancakes."

by Andrew Helms November 21, 2011