There comes a time in most peoples' life when they decide to wrap themselves in a sleeping-bag and crawl around like a caterpillar.
Picture Amber doing this with insect antennae on her head and saying "wiku wiku wiku", and you're basically there.
The term 'wiku' has become a slogan of sorts regarding DMFA or Amber, hence the title of the wiku-wiki.
"Wiku wiku wiku..."
The wiku-worm has appeared in-strip, usually as a filler in the margins or to annoy Fluffy. It first appeared in strip #346 and has subsequently appeared in strips #347, #429, #477, #546, #688 and #702, as well as the second wallpaper war and tag team wallpaper war.
The worm has also been observed by Amber's brother, as noted by Damaris on the CM forum (restricted section - may require login):
"Um, basically the Wiku worm is Amber in a sleeping bag with deedily antenna on her head. This is usually prompted by something like sleep deprivation, or a really stupid e-mail. Darkmoon can attest to this, as he has seen it, and relishes telling the story."
This story may be added in future if Amber does not kill those involved first.