From:https://whatis.techtarget.com/definition/fnord
"Certain words are intended to be undefinable and "fnord" is one of them. First used in Robert Anton Wilson'[s] trilogy, The Illuminati Papers..."
<SNIP>
"In Wilson's trilogy, (based on reports from users), truth is revealed to those who know where to look. The enlightened can see fnord in the empty spaces between unjustified columns of text in newspapers and magazines. Called sticky spots, these spaces are not really blank, but contain fnord, visible only to those privy to heavily guarded secrets and occult powers."
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Basically, "fnord" are words that exist where there is nothing...
TXnMA
I stand corrected, it was originally in the more obscure ‘Principia Discordia’ (1965) by Kerry Thornley and Greg Hill. Fun note: Kerry Thornley served with Oswald in the Marines.
Thanks. Much appreciated.