mid-15c., "deceit, trickery," from Old French tromperie (14c.), from tromper "to deceive," of uncertain origin (see trump (v.2), which has influenced the spelling in English). Meaning "showy but worthless finery" is first recorded c. 1600.
in card-playing, "act of trumping when a player has no cards of the suit led," by 1856, from ruff (v.) "trump when unable to follow suit" (1760), from the name of the old game of ruff (1580s), from French roffle, earlier romfle (early 15c.), from Italian ronfa, which is perhaps a corruption of trionfo "triumph" (from French; compare trump (n.1)). The old game, a predecessor of whist, was in vogue c. 1590-1630.
in cards, "trump when unable to follow suit," 1760, from the card game ruff (see ruff (n.2)). Related: Ruffed; ruffing.