Leadmongering
The act of standing in front of another player in a first-person shooter game to shield them from enemy fire. It is mainly used to guard somebody as they accomplish an objective of some sort such as defusing an explosive or carrying the flag in 'capture the flag' games. Also known as meatshielding(though 'meatshield' implies that the guard is being used against his will)
His teammate was leadmongering the whole time!