I guess Rogue is a term to describe both malicious or poorly coded sites. As a rule of thumb, if scrolling isn't perfectly instant, then a site is "rogue". I found a recent example of a unintentional rogue website: it was a tumblr blog using a preview service that would extract opengraph meta data and display images as a caption to the link. One of the link was an article on a news website where the og:image was incorrectly pointing on a 3MB jpg. The whole tumblr blog would be totally unresponsive to scrolling due to a 50x50 image with a 4096x2048 src.

This was absolutely unintentional and involves at least two intermediates over which the original blogger had no control whatsoever.

Link to the page in question: http://fh2012.tumblr.com/page/6 It so happens it's the tumblr blog of the current favorite to the French Presidential election, and it was the first post so I noticed it :P