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Isbu

"I'm so bummed out". A abbreviation used in texting.
That's terrible news...Isbu!
by Shtella55 September 19, 2009
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ISBU

The International Space Believers Union, popularized by Charls Carroll and Eric Hayden of The Palace
Hey man, do you believe in space?
Yeah of course man, I'm an ISBU member! Space is 100% real!!
by prequel memes.bat February 7, 2025
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