A fnord is a propaganda word conditioned in the masses from a very young age to respond to, usually with fear, anxiety, or uneasiness, but unable to be seen by the general populace. (This definition originates in the Illuminatus trilogy of books by Robert Shea and Robert Anton Wilson.) Sometimes it's used in a sentence to denote a general conspiracy (often jokingly), or sometimes it's used for no reason, especially by Discordians fnord.
https://www.urbandictionary.com/define.php?term=fnord