Just as in baseball where you will try your best to hit the ball that comes into your strike zone, you would date or have sex with a girl/guy that is in your strike zone.
The strike zone a girls body from her knees to her chest. In other words a butter face. The girl has rocking body from her legs to her chest but her face is less than appetizing.
Ryan: Tom would you do that girl?
Tom: I would do her based on her strike zone legs great boobs great face less than average.
Ryan: Yeah you are right her face sucks...but damn tell that girl she has three strikes cause that strike zone is rocking.
When a woman is extremelyattractive, but only from the "knees to the letters", as in a baseball strike zone. She looks good between her neck and her knees.