A rating system used by men to establish whether or not they would fuck a girl. It uses only a 1 and a 0. A girl who is a 1 is fuckable while a 0 is not. The system helps to take away the pressures and variability that the standard 1-10 rating system can create. This allows a man the ability to approach a woman with no doubts.
"Oh shit dude she's a 1!"
"Naw man, she's a 0 in my book."
I don't use the 1-10 scale, I use binary brode.