Quiz: Remember the definition of mal de mer?
"showy, cheaply attractive," 1680s, from flash + -y (2). Earlier it meant "splashing" (1580s); "sparkling, giving off flashes" (c.1600). Related: Flashily; flashiness.
granny flat, in nothing flat
[carnival sense fr earlier meaning of flats, ''playing cards,'' or fr earlier meaning ''dishonest dice'']