When the definition of a word describes the people who use the word, rather than what the word is. Usually used when someone is extremely angry at being called said word.

Anti-Definitions commonly start with "A term used by," "A word used by," ETC
Extremely angry Urban Dictionary poster who got called a loser a few minutes ago: "Loser: A term used by terminally online and friendless people who SUCK!"

Normal, well-adjusted person looking for the actual word: "I came here to look for what the word means, not an Anti-Definition."
by Stinkton October 25, 2023
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