When a website ends up denied (saturated with external communications requests, such that it cannot respond to legitimate traffic, or responds so slowly as to be rendered effectively unavailable) due to a sudden enormous spike in popularity.
A Social Network Denial-of-Service (SNDoS) could be started by one Facebook user setting his/her wall status to: "Go to urbandictionary.com, type in your first name, copy and paste this as your status and the First entry for your name under comments"
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi