Definition of flash
(adj)
tastelessly showy; "a
flash car"; "a flashy ring"; "garish colors"; "a
gaudy costume"; "loud
sport shirts"; "a meretricious yet
stylish book"; "tawdry ornaments"
(verb)
gleam or
glow intermittently; "The lights were flashing"
appear briefly; "The headlines flashed on the screen"