The use of two basic weapons in Halo 2. These combos are usually, but not limited to:
Plasma Pistol & SMG
Plasma Pistol & Magnum
Plasma Pistol & Plasma Rifle
Plasma Pistol & Plasma Pistol
Plasma Rifle & SMG
Plasma Rifle & Magnum
Plasma Rifle & Plasma Rifle
The purpose of these weapons is to quickly take down the shield of an enemy which is what the plasma weapons specialize in. The human weapons combined with the plasma weapons make for a quick drop in your opponents shield and then some heavly delt damage after the shield goes down.
Drop that n00b combo and fight me like a man!
I just pwnd that guy with a n00b combo!