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1. Wallhacks
A cheat in FPS video games that enables you to be able to see you enemy and other objects through the walls.
Wallhacks will most likely will get you banned from PunkBuster or VAC.
CS:S Player: "Wow he prefired me he probably has wallhacks."

CS Player: "He's been playing only 2 days and is better than me, he must be wallhacking!!!"
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