Top Definition
When two mutual friends consistently cosplay characters in romantic relationships, even if one or both of the friends is in a relationship with a significant other.
A: So X and Y are cosplaying Hungary and Prussia, Eridan and Feferi, Sakura and Sayoran, and Faust and Eliza? Are you sure they're not dating?
B: Nope, they're just in a cosplationship!
by blueskiesforme January 16, 2012
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