Swifty Nade

When playing first-person shooter games with friends, the "Swifty Nade" is the act of tossing a grenae into an area populated by your teammates, waiting a few seconds and then saying "Oh, Grenade.." just a second or so before it goes off, killing everyone in the room.

Especially popular during games of Capture the flag while playing Halo or Halo 2.

See Also: Teamkilling Fucktard