Cite
 
filk: /filk/, n.,v.

[from SF fandom, where a typo for ‘folk’ was adopted as a new word] Originally, a popular or folk song with lyrics revised or completely new lyrics and/or music, intended for humorous effect when read, and/or to be sung late at night at SF conventions. More recently (especially since the late 1980s), filk has come to include a great deal of originally-composed music on SFnal or fantasy themes and a range of moods wider than simple parody or humor. Worthy of mention here because there is a flourishing subgenre of filks called computer filks, written by hackers and often containing rather sophisticated technical humor. See double bucky for an example. Compare grilf, hing, pr0n, and newsfroup.