Filk

/filk/ [SF fandom, where a typo for "folk" was adopted as a new word] A popular or folk song with lyrics revised or completely new lyrics, intended for humorous effect when read, and/or to be sung late at night at SF conventions. There is a flourishing subgenre of these called "computer filks", written by hackers and often containing rather sophisticated technical humour. See double bucky for an example. Compare grilf, hing and newsfroup.

Free Online Dictionary of Computing