Someone who gives up incriminating evidence to people they have no business talking to in the first place. Some snitch because they need attention others snitch because they are scared.
97sirhb: Hey josh, did you know black ops is going to leak?
Josh: No! tell me right now who is involved and where to
97sirhb: His name is ungodly and Computer healer. I just thought you would want to know they are going to pirate black ops.
Josh: Thanks! For your snitching on your friends and the entire community I will reward you with a mustache ride and a remote control car.
97sirhb: 1337!! I am so CooL!