When a man is receiving oral sex and the female looks upward as she is blowing the male. Is best when two or more are all fish eyeing at the same time.
Guy 1: Man does that chick love to give a blowjob!
Guy 2: Yeah - but does she fish eye?
Guy 1: Of course - don't they all?
a traditional way of blessing a karaoke party is to keep a fish in a tank next to the stage. later it turns to an act of extreme violence in vietnamese gunfights to execute the fish by two white dressed professionals as an explicit sign for enemies.
ganster boss: two of miss tang's gang have execute the fish last night in our queen bee karaoke place.
boss of the boss: this was the 5th fish execution this week! oaaargggghh! FIGHT!... and no mercy!
It's when you can see the full outline of a dude's bell-end through the fabric of whatever he's wearing on his undercarriage. Because this spectacle ALWAYS looks like an actual fish eye. This is the truest meaning of the term because it is so common and so hilarious. Fellas, you thoughts you'd pulled the wool over with your tales of jizzing in our eyes but look down next time you're wearing your softest jim-jams, and there he is, finding nemo.
NB: Fish eye is most notable in the circumcised community, it also features heavy in those belonging to the 'well-endowed' faction.