A variation on the word doppelganger, a doppelgangster is a mobster or thug (such as Al Capone or Snoop Dog) that bears a strong resemblance to oneself.
John: "Dude, John Gotti is your mom's doppelgangster."
Travis: "Not cool bro."
Someone that looks the exact same as another person. yet not a twin. ghost identical to living person: an apparition in the form of a double of a living person
yo i saw someone that looked just likeu...could have been your doppelganger