Screen looker is someone who spies on their opponents in a split screen multiplayer match. It is used to determine their location, amount of health, and carried weapons. It was an integral part of Goldeneye and Perfect Dark gameplay.
"Hahah. I won again! I can't believe I killed you with a Klobb. If you were a better screen looker, you would have seen me coming up from behind you."
A person who tends to look at other peoples screens in hopes of beating them at any or all first person shooters. He uses the justification that one only plays games to win -- and to achieve this goal it's fine to screen look. A.K.A Brad Baum
Brad Baum, you're such a screen looker. You will leave a hollow life if you continue to do so.