This is a quote from the book "The Gentleperson's Guide To Forum Spies" by Cryptome.org
...a 'forum slide.' The second requirement is that several fake accounts exist, which can be called upon, to ensure that this technique is not exposed to the public. To trigger a 'forum slide' and 'flush' the critical post out of public view it is simply a matter of logging into each account both real and fake and then 'replying' to prepositined postings with a simple 1 or 2 line comment. This brings the unrelated postings to the top of the forum list, and the critical posting 'slides' down the front page, and quickly out of public view. Although it is difficult or impossible to...
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