Top definition
1. Somone who cheats in computer games by using a hack, patch, or altered code to allow them to move, see, or fire through walls putting them at a significant advantage to other players.
2. Someone who cheats at computer games.
ULTRAHAX0R2001:"dude I just owned you wit mai skillzzz"
VMECH: "wtf wallhax0r!!!"
by brah September 14, 2003
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