Root words: Fu, meaning Fuck, and Lationship, meaning Relationship.
A Fulationship is having a false relationship with someone based only on having sex.
Unlike Fuck Buddies, which are friends who have sex with eachother... In a Fulationship you don't even have to like the person, your only in it for the sex.
"John is in a Fulationship with Jane... He doesn't even like her!"
"I think i want a Fulationship with Jane because she's so hot, but man is she stupid!"
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.
That initial period of a relationship where you and your prospective mate aren't officially dating for whatever reasons, but spend hours talking to each other (face to face, online or over the phone) and thinking about each other.
A state of mutual fixation where neither party may admit to it.
Symptoms: Excitement, attraction, loss of sleep, frustration and confusion
Baby our fixationship period really took a toll on me! I'm so glad we're officially dating now.