Gib

A Gib is piece of an enemy, usually after blown off with an explosive weapon or a powerful weapon. Killing someone in this manner is know as "gibbing". This can be done in both Call of Duty 4: Modern Warfare and Call of Duty: World at War, but most notably in the latter. The only instance in Call of Duty 4: Modern Warfare where gibbing is seen is when you snipe off Imran Zakhaev's arm in the level, One Shot, One Kill. In Call of Duty: World at War you can do this throughout the entire game, decapitating and blowing off limbs, or even blowing people in half. This, along with strong language, is most likely why the two most recent Call of Duty games received the M for Mature rating. Gibing is also required to complete the multiplayer challenge Gib Factory onCall of Duty: World at War.

Trivia
On occasion, when you blow an enemy's head off in Call of Duty: World at War, you will hear the enemy shriek in agony for a few seconds after. Even without a mouth/head to scream with. This is most likely a simple designer error.