Resizing an image larger to fit on many pages. These are then printed out and placed side by side to recreate a large poster of the original image. Usually the image is also modified to be made up of small dots, similar to old comics.
"That poster is huge, it must have cost you hundreds."
"No, Wendy taught me about rasterbating, it only ended up costing like $10."
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.