Any position in a First Person Shooter (FPS) videogame, that allows the player to watch all vulnarable positions, making him "omnipotent" to all attacks. The only real weakness of an omniposition is a tendency to run out of ammo.
"Dude, Bloodgoose, I found an omniposition on this map. I'm pwning so many noobs come help me defend it!"
"OMW, but i'm already running out of ammo, I'll come after I respawn."