There is nothing new here. Years ago, when Grand Theft Auto 3 hit big, all the birdmen began putting out Grand Theft Auto 3 clones. Years before that, it was first person shooters. More years before that, it was bloody fighters. One can find the birdmen back in the 8-bit generation making platformers. They would look at Super Mario Brothers and go, “Oh, I get it! We just need to make a game with cute music, colorful world, and upgrades like the magic mushroom!” Slapping wings on their arms, these games flopped. Amazingly, despite how many times the birdmen fall down, each generation they are ready to put on feathers and jump off a cliff.
After Halo 2 (and somewhat before), FPS would come out and try to cash in on the FPS trend happening in gaming. Somewhere down the line, the term was adopted to say that this game would be bigger then Halo. With a flood of FPSs on the consoles, the term refered to all of them.
It might have come from Killzone, Sony's answer to Halo.
