1. A person who can't read a tape measure, cannot reasonably determine if something is plumb/level/square, or cannot tell if two (or more) different objects are the same color. Generally speaking, someone you don't want doing any type of finish work on your house.
2. Someone who, at an early age, has been hit about the head something fierce, and now one eye wanders.
1. Johnny: Ma!?! How does this picture look on the wall?
Ma: Johnny, have your brother hang it. You've got fuck eye, son. It's not even close to level.
2. Dude 1: Dude, seriously, you're not even looking at with with your right eye.
Dude 2: Dude, you know I got hit in the head with a baseball when we were kids.
Dude 1: Oh, that's right. I forgot you've got fuck eye from that! My bad.