Someone who is regarded as being worse than a criminal, even though reporting criminals is what responsible citizens are supposed to do to help keep their communities safe. Snitches lately have become the subject of the "Don't Snitch" campaign, an idea perpetuated by gangs and rap music as a way to encourage anarchy and allow every murderer, rapist, thief, and scoundrel to get away with what they do. Sadly the law-abiding members of the community, especially children, are being suckered into this ideology.
Ghetto-Joe got props for having the balls to rape little Tanika in public. Drew got gunned down for reporting him to the police. Who cares if Drew was only looking out for his sister? He was a damn snitch! High five, Joe!