1. An immediate surge in hit rate on a webserver caused by an announcement on a high-traffic website; a Nivenesque "flash crowd".
2. An unintentional denial of service to a website as a result of a surge in hit rate following an announcement on a high-traffic website.
See also: slashdotted
Bill Joy's _Dangers of Lego Blocks_ site succumbed to the slashdot effect scant hours after going live.