sporgery
The disruptive act of posting a flood of articles to a newsgroup, the article headers having been falsified so as to make the articles appear to have been posted by people other than the true poster.
countable, uncountable
Tilman Hausherr, a daily contributor to alt.religion.scientology, coined the word 'sporgeries' (spam-forgeries), and promoted software to kill the unwelcome messages.
Where it comes from
Blend of spam + forgery; coined by Tilman Hausherr in 1999 on the alt.religion.scientology newsgroup.
Adapted from the Wiktionary entry sporgery (CC BY-SA 4.0).