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Refers to a person who is in a close, trusting and caring friendship with someone else of a strictly platonic nature.
They may act, talk, and think as a married couple would, but they are not at all romantically inclined.
Crystal: Hey girl! I brought you some freshly baked chocolate chip banana bread

Sky: OMG, I love you! You're the best pseudopartner ever!
by starsheepie August 11, 2014
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