The MOAB killstreak is a nuke that kills the entire enemy team and works an an EMP, however it does not end the game. To get the MOAB you need to get 25 kills in a row (24 if you have hardline) with only your class, not killstreaks (you can use UAV, Advanced UAV and any other non lethal killstreaks). It is also automatically on for everyone meaning you don't have to select it. It will always be there. The best way to get the MOAB would be by using specialist because you arent tempted to use killstreaks and you can have all the perks once you get past 8 kills (7 with hardline) including.
Added by: CODMW396 Dec 30th 2011, ID#4473