Technical

From Call of Duty - Wiki on Neoseeker

A Technical is an improvised fighting vehicle that is typically a heavily modified civilian vehicle though this distinction can include military vehicles that have been modified with additional firepower or armor.

In Game

They are seen in "Charlie Don't Surf" and "Death From Above" in Call of Duty 4: Modern Warfare. It is a red or white 4x4 pick-up has a mounted 50cal MG on it. It has the only M2 Browning machine gun in the game.