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1. A combination of the words "weapon" and "pwn," most suitably pertaining to video games of the First-Person Shooter genre. (Is also popular with MMOs.)

2. The name of a professional Call of Duty team: "WeaPwN."
Player 1: "Choose a gun to spawn with"
Player 2: "your mom is my only weapwn"
by Rusty J. Shackleford March 11, 2012
Alternate to weapon, primarily used in relation to online gaming.
Rocket Launcher OMFG weapwn of mass destruction!
by px May 06, 2005