To attack somebody or somebody's reputation, character, or good name by making slanderous or libelous statements.
An example of defamation is a false and malicious published statement that damages somebody's reputation.
by Jafje September 16, 2007
2 more definitions
The colloquial term for Wikipedia.
"Have you read the article on Larry King? OMG defamation!"
by Limecat4eva October 30, 2006
When a website gets hacked.
Oh! no someone hacked my website, this is defamation.
by Aaron The Gay September 27, 2006