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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.
Fish eye by Mushy Piglet October 7, 2015

Fish-eye 

Fisheye (noun)

A slang term describing the situation when having intercourse with a woman from behind you start to put it in her ass, at which time she quickly snaps her head to the side and looks back at you with one eye (like a fish).
Oh man, I got the fish-eye big time last night! It was hillarious!
Fish-eye by francois m December 3, 2006

fish-eye 

when one peers over their shoulder while receiving sex from behind
Lucy gave me the ol' fisheye last night when I was banging her doggy style.
fish-eye by Timmy August 8, 2003

fish-eye 

fish·eye
ˈfiSHˌī/
noun
noun: fish-eye

1.

a wide-angle lens with a field of vision covering up to 180°, the scale being reduced toward the edges.

2.

USinformal

a suspicious or unfriendly look.
fish·eye
ˈfiSHˌī/
noun
noun: fish-eye

1.

a wide-angle lens with a field of vision covering up to 180°, the scale being reduced toward the edges.

2.

"Wally gave him the fisheye"
fish-eye by Charlotte 17 February 9, 2015

Fish-eye 

Dont call me fish-eye
Fish-eye by Anonymous March 24, 2003

Fish Eye and the Dolphin 

When Doing a girl doggy style and you attempt to put it in her bum, she looks back at you with one eye (like a fish) and goes "ah ah ah ah ah ah!" (the dolphin)
its pretty self explanitory dude!
Fish Eye and the Dolphin by Jack D February 10, 2005