[Usenet; very common] Fucking, in the expletive sense (it refers to
the Unix filesystem-repair command fsck(8), of which it can be said
that if you have to use it at all you are having a bad day).
Originated on {scary devil monastery} and the bofh.net newsgroups,
but became much more widespread following the passage of {CDA}. Also
occasionally seen in the variant "What the fsck?"
[glossary]