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1. A romantic partner who has been unfaithful, shows little or no genuine remorse, and is likely to be unfaithful in the future.
2. Someone who has violated your trust and/or confidence in a horrible way.
3. The sound you make when your friend finally ends the relationship with the aforementioned fidouche.
1. How many times has he cheated on her? Two, three times? She needs to wash that fidouche out of her life.
2. I can't believe you slept with Sally when you knew I had a crush on her, you're such a fidouche.
3. Person 1:" so I was like, that's the last time you lie to me about your affairs, we're through". Person 2: "Fidouche!"
by Filtee January 06, 2012
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