"Hot to Not Ratio" is the ration of hot girls to not hot girls.
If you're in a club/bar and there are one or two smoking hot girls, but the rest are dogs, then the "Hot to Not Ratio" is quite low.
But if you're in a club/bar and there are many hot girls around and only a few mingers, then the "Hot to Not Ratio" is quite high.
What you want is a high "Hot to Not Ratio"
The simple way of knowing if you should pursue a chick. Her hotness must out weigh her thotness.
Yo, what do you think about that chick over there? "Bro her hot to thot ratio is a 40/60" Aw damn never mind then.