When you read/see something on your computer screen that doesnt make u laugh, but makes you breathe through your nose rapidly
Nikki: BTNR, ur joking right?
Jacob: No? why would i, uve seen my itunes.
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.
"Sub par. The nips are like pancakes."