Computer Filk

The dictionary has this to say (I'm intriugued):

/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