Relationshit
When a fuckboy gets a girl really emotionally invested in him to the point where she thinks it's a full blown relationship, but it's actually a relationshit. She doesn't mean anything to him, he just needs her to bust a nut or unleash his emotional baggage.
Scott: Ay Brian, are you and Catherine a thing right now or what? Is she your girlfriend now man?

Brian: Nah bro, it's just a relationshit, idgaf about this bitch.