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A person, often an ass hole, that tells you something that makes your dreams seem more out of reach and almost impossible to achieve.
Aaron: "Next year I'm going to NYFA to become a movie director!"

Peter: "Do you actually think you could make a movie even close to as good as Inception?"

Ash: "Dude, don't be a dream fucker!"
by the voice of the common cock September 21, 2010
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Someone who always penetrates one's dreams or ambitions with his constant pessimism and negative vibes.
1. Dream-fucker: So tell me, where do you see yourself 5 years from now?

Dreamer: a senior partner at the law firm I'm working for right now

Dream-Fucker: HAHAHAHA! YOU SURE WILL HARVEY! HAHAHAHAHA!
by amkaki December 08, 2013
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