Definition
A humorous holiday-season spin on 'on god' that invokes Santa's naughty list to emphasize you're telling the absolute truth—swear to the man in red that you're not lying.
Example Usage
On claus, I saw the biggest snowstorm of the decade and it was absolutely insane.
Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=on%20claus&defid=14400087)
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See “on claus” in Corporate Speak, Gen-Z Slang, Pirate Speak, and more.
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