What do teammates shout on BO2 Multiplayer?

Solution 1:

The player and other players deliberately shout these comments as if they were talking through a Communication device to their teammates for added realism.

Here are the reasons for all your "shouts":

• Support! (Subboy) is said when throwing down Tactical Equipment (which is obviously to support your team)
• Going Explosive! is said again, obviously when throwing explosives towards enemies, asking teammates to back away, keeping them safe.
• Snipers down, move up! is said when you/team kills an enemy sniper, basically meaning "You are free to poke your head out now!"
• Move it! Sniper! is said when an enemy sniper starts shooting or kills a teammate indicating that you need to get down and be ready for it.
• Confirmed! I don't really know this one well, but I'm 99% sure it's when you confirm a dog tag, or instead, kill an enemy, confirming a kill.

If there's anymore you want me to "transcribe" then just give me a shout.
Good luck!

Solution 2:

To me with my headphones on it sounds like he is saying "Support".