What is 4 Pro?
The cream of the crop; the best of the best.
Dude 1: Dude, do you play Halo 3?
Dude 2: Yeah dude I'm 4 pro.
Dude 1: What do you mean 4 pro?
Dude 2: Dude I can't even play with the pros, they pay me not to play I'm so good.
See leet, pro, expert, master, player