The story
Formulated in 2005 by a user named “Nathan Poe” on the website christianforums.com, originally in the context of creationism.
Etymology from Wiktionary, CC BY-SA 4.0.
Poe's law
Today it means: The observation that, on the Internet, without a clear indication of the author's intent, it is impossible to tell the difference between sincere extremism and a parody of extremism. Full definition →