When a relationship between two individuals is built solely on the premise of Filatio. One or neither party would like to engage in a full relationship.
Friend: You still talk to that guy from last semester?
Me: Nah, it ended up being a filationship.
by SheDev February 6, 2018
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A very, VERY casual sexual relationship. Generally noncommittal.
"So are you guys together now or what?"
"Oh hell no, it's just a filationship."
by Gregory Novak April 14, 2007
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