[Usenet] Per-user file(s) used by some Usenet reading
programs (originally Larry Wall's rn) to discard summarily
(without presenting for reading) articles matching some
particularly uninteresting (or unwanted) patterns of subject,
author, or other header lines. Thus to add a person (or
subject) to one's kill file is to arrange for that person to
be ignored by one's newsreader in future. By extension, it
may be used for a decision to ignore the person or subject in
other media. See also plonk.
