This is a term I made up for a female's pussy that smells like canned tuna. Usually the stink is so pungent you wont wanna go down on the bitch, trout is a type of fish, hence the name trout pussy.
dude, i went down on maria's pussy when i was drunk. the next time i was sober and i went down on the broad she smelt like tuna. she must have trout pussy