" Alas, poor Yorick! I knew him, Horatio, a fellow of infinite jest, of most excellent fancy. He hath borne me on his back a thousand times, and now, how abhorred in my imagination it is!"
cron is a Linux utility which schedules a command or script on your server to run automatically at a specified time and date. A cron job is the scheduled task itself. Cron jobs can be very useful to automate repetitive tasks.
For example, you can set a cron job to delete temporary files every week to conserve your disk space. Some programs, such as Drupal, may even require you to set up a cron job to perform certain functions.
Scripts executed as a cron job are typically used to modify files or databases. However, they can perform other tasks that do not modify data on the server, like sending out email notifications."
And sometimes people even refer to a cron job that they do themselves on a regular basis - I know geeks right.
In this case @Bootie is either manually or by the use of script removing members who have not logged in some length of time - I forget how long that is.
I have been informed by "certain parties" that can not be named, that the next name on the CronJob list is: Meat Grinder, unless a certain payment is sent to say Darth Panzer, who will of course hold said funds for said individuals...