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1.
DoppelGangster: A combination of the words "doppelganger," meaning "ghostly evil mirror image"
and "gangster," meaning proffessional criminal member of a family or group.
Combined the words mean "Criminally Evil Mirror Image."
Used in sentance: "I might have to do work tonight, I'm going to bring my DoppelGanster."
Or: "If you contiue to mistake kindness for weekness you will meet the DoppelGangster."

This can also refer to a friend that has a more street-oriented style than you:
"My Friend JC may resemble me, but he it's more like having my DoppelGangster around."
by Tha MIssing Link December 01, 2009