Covering a dick with honey and putting skittles all over it, ala ants on a log, then sucking said dick.
My wife wanted a sweet desert after dinner, so I prepared her a rainbow trout.
by Dsenight February 8, 2020
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A rainbow trout is a trouser trout that has been painted in the rainbow colors of the gay pride movement.

Very festive.
To add a bit of zip to the parade, Buford took out his rainbow trout and waved it around.

There was much applause.
by scodder May 14, 2010
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A young gay man sought after by a much older gay man.
George went out to the gym to scope out the new rainbow trout lifting weights.
by twoboxman December 29, 2010
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The Rainbow Trouser Trout... Put on your favorite episode of River monsters and pound two bowls of Fruity Pebbles. As soon as your wife complains about the show, vomit all over your dick and violently shove it down her throat whilst screaming "fish on" and pulling up on your dick like a fishing rod.
If this bitch keeps running her pole holder, she's gonna end up catching a Rainbow Trouser Trout.
by MrHead April 25, 2022
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A person who goes on a straight date despite being flamingly homosexual. (This is typically but not exclusively used to describe a situation where the couple met online i.e. Tinder)
My friend Melissa went on this date with a guy from Tinder, and the moment he opened his mouth and called his female friend a queen…she knew he was a rainbow trout.
by Darkraiguy July 4, 2022
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