A person who exploits an unfair advantage, typically in an online game.

See Fender

Typically amateur attackers known as "script kiddies" who gather victim computers (referred to as "roots") that can be used to host a phishing site or a spam relay. In some cases, exploiters will break into credit card databases directly to harvest credit card data, skipping the phishing stage entirely.

The guild: Karate Apocalypse.