in the multiplayer mode of Call of duty modern warfare to you have what we call killstreaks. these can be unlocked by getting x amount of kills without dying, and if its the one you have equipped. if you get 9 kills and have the ac-130 killstreak equipped, you can summon an ac-130 gunship that you control the weapons in. when you do this the enemy's team announcer will say enemy ac-130 above, but the announcer for the spetsnaz team screams it and it is now a meme amongst Call of Duty fans and others.