KillerKore13's definitions
A person(usually a teenager) who rarely sees the light of day and spends his time playing videogames ranging from: Modern Warfare 2 to World of Warcraft.
Me: Dude, I was enjoying a casual game of Modern Warfare 2 when this 10th Prestige dropped into my game and fucked everyone up.
Friend: What a fuckin Basement Ninja.
Friend: What a fuckin Basement Ninja.
by KillerKore13 December 12, 2009
Get the Basement Ninja mug.