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1951, proprietary name (Dane & Co. of London) for a brand of fluorescent paint.
Blatantly gaudy; cheaply flashy: smoldering pageant turns totally day-glo/ plenty of sequins and day-glo fur/ day-glo glamor
[1950s+; fr the trademark of a brand of paint that makes things glow under a black light and produces lurid, psychedelic color effects]