Top Definition
1. Old school hacker caught in 1998 for compromising top 5 fastest computer network in the world.
2. The act of lurking on voice bridges around 1:00am EST and/or 3waying the PLA voice bridge when there are no annoying people on PLA's bridge.
3. Someone who spends way to much time on irc.

See sandnigg0r, sandnig3r, old skewl.
1. Damn sandnigg0r is still haunted by the shit he pulled when he was 18.
2. Is sandnigg0r 3waying the PLA bridge again!
3. Dude sandnigg0r you need to get a life.
by Emmanuel Goldstine September 23, 2003
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