When you try to download pr0n onto your roommate's computer cuz you
broke
yours, and download a few trojans, said computer becomes infected with
such. Some sort of computer ointment needs to be applied to remove it,
which has to be done very carefully to ensure that no skankersores come
back. Especially if pirate
hooker pr0n was downloaded, in which case
heavy-duty ointment needs to be applied.
Similar to computer
AIDS, except slightly more reparable.