Resembling floss in texture or appearance; soft and fluffy, or flashy and showy in style.
From 'floss' (French floche, a lock of wool or silk) plus the adjective-forming suffix '-y'. The 'flashy' meaning developed as slang in the 20th century.
The word 'flossy' shows semantic drift in real time—it started meaning 'soft and fluffy' but became slang for 'flashy and ostentatious,' the way language evolves when different communities adopt and reshape words!
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