trout

Etymology

From Middle English troute, troughte, trught, trouȝt, trouhte, partly from Old English truht (“trout”), and partly from Old French truite; both from Late Latin tructa, perhaps from Ancient Greek τρώκτης (trṓktēs, “nibbler”), from τρώγω (trṓgō, “I gnaw”), from Proto-Indo-European *terh₁- (“to rub, to turn”). The Internet verb sense originated on BBSes of the 1980s, probably from Monty Python's The Fish-Slapping Dance (1972), though that sketch involved a halibut.

noun

1. Any of several species of fish in Salmonidae, closely related to salmon, and distinguished by spawning more than once.
   Many anglers consider trout to be the archetypical quarry.
   “This morning,” he said, “We will fish, Turner. We will cast for trout so that we may catch grayling.” 1922, Michael Arlen, “3/19/2”, in “Piracy”: A Romantic Chronicle of These Days
2. (Britain, derogatory) An objectionable elderly woman.
   Look, you silly old trout, you can't keep bringing home cats! You can't afford the ones you have!

verb

1. (Internet chat) To (figuratively) slap someone with a slimy, stinky, wet trout; to admonish jocularly.