This term has many connotations but is usually used illicitly.
"Let's go fishing..."
Many forms of enticement or entrapment, here are a few examples among many.
"Fishing for Cigarettes"
"Fishing for Alcohol"
"Fishing for Clients"
"ey foo, let's go fishing..."
"heyyy girl, let's go fishing..."
Looking for victims
Uk slang commonly found in drill songs
Bro! hop in the car and let's go fishing.
Have sex outdoors or in a vehicle by your fishing spot
Hey, wanna go fishing at my spot?
Being an upperclassmen, but trying to pick up freshmen who are willing to jump at your bait as you are older and are considering them, the younger fishes.
Man is John fishing again?
Ya, he's been trying to get that freshmen chick for awhile.
Inserting a worm into your urethra
I came so fast after fishing last night
A leisure activity enjoyed by many men and women in the world. It requires great physical and mental strength to overcome. Fishing can also refer to as catching girls. Just like the phrase says “there are many fishes out there to catch”
Person 1: let’s go fishing
Person 2: ok so tomorrow?
Person 1: ok
Next day
Person 2: where are you
Person 1: oh I thought you meant tomorrow as not today