Trout fishing 

When women glance at men's crotches in social situations or at gatherings trying to determine a mans gerth.

Noticed my buddies ex-wife trout fishing all last night at the block party.

Trout fishing by Stanley Says March 26, 2017

Fishing for brown trout 

Anal sex

I wanted to try something new and my girlfriend said try fishing for brown Trout

Fishing for brown trout by Anonymous September 5, 2003

fishing for the one-eyed trouser trout 

searching for a small penis in a large amount of pubic hair

girl 1: "hey, how'd it go with Alex?"

girl 2: "Meh, not good, when we got down to business, i ended up fishing for the one-eyed trouser trout for like an hour!"

fishing for the one-eyed trouser trout by zabuma March 30, 2009

Fishing for brown trout 

Lifeguard slang for seiving turds out of a swimming pool. This is usually done after clearing the pool, followed by a 1 hour break from pool use while you 'shock' the pool (i.e. dump a ton of chemicals into it and the run the filters at full blast).

I had to go fishing for brown trout today during the 'mother and baby' swim lessons. At least I got paid for an hour of playing computer games while the filters did their thing.

Fishing for brown trout by JG El Supremo February 15, 2020

fishing for boneless brown trout 

to take a shit, or numerous shits

My stomach hurts so I'm gonna go fishing for some boneless brown trout.

fishing for boneless brown trout by The dude May 1, 2003