The phrase Joe Job was coined by an attack at Joes.com in January of 1997. A spammer using the free services of Joes.com had been barred from use and sought revenge against those responsible. The spammer's revenge was felt across the Web via a flood of spoofed e-mails sent out in the name of Joes.com in attempt to enrage recipients into taking action against the company's Web site, which, indeed they did. [Source: SitePoint]

SitePoint: Sabotage! Coping With The Joe Job
One particular type of sabotage you may come across has been used historically as a revenge tactic against those who have spoken out about spam and hacking; it's called a "Joe Job". This form of sabotage is increasingly used as weapon in the online marketplace, and, if you're unfortunate, it may one day be aimed at your Website.