RationalWikiWikiWiki
RationalWikiWikiWiki refers to various attempts by RationalWiki or RationalWikiWiki members to set up a wiki monitoring the goings-on at RW and/or RWW; and/or to supplant one or both of those two wikis.
Wikidot Rationalwikiwikiwiki
The Wikidot Rationalwikiwikiwiki was active from 16th April to 17th April 2008, edited exclusively by "rwwadmin" (no relation to RWW's Admin), and Icewedge.
Ratwikiwikiwiki
Ratwikiwikiwiki dates from around the same period, and briefly involved Bohdan, AKjeldsen and Human. It is completely devoid of content, but does have a dancing banana where a brain would usually be found.
Tisane iteration
The Tisane iteration of RationalWikiWikiWiki was launched on 1 September and died on 11 September 2012, after an essay concerning sex-related public policy was reported to the site's webhost by a disgruntled user, resulting in an "adult content" terms of service violation notice that forced the site to either give up its mission of uncensored free exchange of ideas or shut down.
Other
There have been many other RationalWikiWikiWikis over the years, none of which have fared well. Their rises and falls have been documented at RationalWikiWikiWikisWiki. There is also a mock RationalWikiWikiWiki at http://rationalwiki.org/wiki/Fun:RationalWikiWikiWiki .