It says its On Hold, I printed this paper ages ago, and I can't delete it! I tried clicking the delete button, hitting delete on my keyboard, restarting, and the application won't Auto Quit anymore because of it! How do I get rid of it?
You could try pausing the printer, and then deleting the task.
In some circumstances, Apple advises users to delete the printer definition and add it back again (example). Perhaps a confused print queue is a circumstance where that would be the simplest solution. Even though if seems rather drastic, it might be the fastest fix!