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A straight-edged lunatic who goes full psycho and stabs drug dealers in the face because they're ruining the neighborhood and making everyone high and stupid.
I saw D. D. K. on the corner with a switchblade and a death stare. He looked like he just came out of a prison riot.
My cousin got D. D. K. ed because he was selling crack to kids during lunch.
The guy who killed the drug dealer had a tattoo that said 'No drugs, no problems.'