Jeff: Um, nothing...
Jake: ...Were you rosterbating?
Jeff: Maybe. How can you blame me? My quaterbacks are Aaron Rodgers, Phillip Riv---
Jake: Shut up you weird fuck.
"DUDE ARE YOU ROSTERBATING RIGHT NOW?"
Rosterbation: The near pornographic pleasure derived from over-excited interaction with a sports team's squad roster.
While can be relating to a real team, as in a fan rosterbating to their professional teams lineup, it usually refers to the narcissistic pleasure of rosterbating to a line-up created by the rosterbator. Examples include a fantasy league team, or a video game career mode team.