The phenomenon of playing a game on Steam and either getting killed or missing vital information due to Steam blocking out the bottom-right corner of the game to tell you that a friend has logged into a different game. Named for mailman Cliff Clavin from the TV show "Cheers," who often spouted useless, wrong, and/or unwanted trivia to the annoyance of the people around him.
"FUCK, I'm dead! I would've SEEN that landmine if I weren't being Steam-Clavined just then!"
by Defenestrator January 1, 2015
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asshole who gives useless information, originated from the sitcom Cheers.
That fucktard just pull a Cliff Clavin. He gave me some useless shit.
by Anonymous February 18, 2003
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A little known fact of useless knowledge that some barstool prophet spews out to make conversation, and to make themselves the smartest schlep in the room. Re: Television show Cheers, Cliff Clavin.
Simple Clavinism, Coffee: nectar of the gods.

little known fact, coffee makes the world go around.
by PhyscoBilly March 14, 2022
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