The story
From blast (“to play very loudly”) + Italian -issimo (superlative suffix), by analogy with fortissimo.
Etymology from Wiktionary, CC BY-SA 4.0.
blastissimo
Today it means: Played extremely loudly; fortississimo. Full definition →
Today it means: Played extremely loudly; fortississimo. Full definition →
From blast (“to play very loudly”) + Italian -issimo (superlative suffix), by analogy with fortissimo.
Etymology from Wiktionary, CC BY-SA 4.0.