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Very loud; even louder fortississmo
I only know because I'm a Bass Clarinet and when my director tells the band to play fortississmo I intentionally play way louder just to piss him off. blastissimo
by BassClarinetsGiveYouLife2016 October 29, 2015
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N, blah-STEE-seemo slang term meaning fucking loud as shit.
My director wasn’t happy with my triple Fortissimo so I cranked my guitar to Blastissimo.
by Jimi freaking Hendrix September 24, 2018
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