"A Wikroll is when a person rudely interrupts an on-line conversation to provide a link that seems to have nothing to do with the topic at hand, claiming that it goes to the video for Rick Astley’s “Never Gonna Give You Up.” But the link actually goes to a Wikipedia article that adds relevant insight to the discussion."
via Ironic Sans:
"A Wikroll is when a person rudely interrupts an on-line conversation to provide a link that seems to have nothing to do with the topic at hand, claiming that it goes to the video for Rick Astley’s “Never Gonna Give You Up.” But the link actually goes to a Wikipedia article that adds relevant insight to the discussion."
http://www.ironicsans.com/2008/03/idea_the_wikroll.html