kill file n.
[Usenet; very common] (alt. `KILL
file') Per-user file(s) used by some Usenet reading programs
(originally Larry Wall's rn(1)
) 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.