Verb: The sexual act of a man sitting above another persons face and swinging his penis at his or her mouth so that it resembles a fly-fishing poll and the recipient resembles a fish.
My girlfriend wanted to get kinky so we engaged in a little fly-fishing.
The kind of situation when you are standing at a urinal looking like your doing something perverted because you can't find the opening to your underwear.
Urinal User #1: "Dude! WTF are you doing?!"
Urinal User #2: "Relax, I'm just Fly-Fishing"