This is a ratio applied to certain bros that have a very significant texting relationship with a certain chick. A low pussy to text ratio would imply that this bro is not getting the amount of pussy that he deserves based on the amount of meaningless text conversations he has with said chick.
Pussy to text ratio = amount of pussy / amount of mind-numbing texts
Sean: Dude, what the hell. You've been textin that chick like its your job. How have you not shown her your snake yet?
Jake: I don't wanna talk about it man.
Sean: Your pussy to text ratio is lower than my grandpa's balls, and those balls are very low.