When a male moons someone and their balls are showing.
The boys on the bus mooned a group of girls on the sidewalk, with their fly's eyes prssed up against the window.

A couple walking along the beach were treated to fly's eyes, courtesy of a dirty old man up on the hill.
by Bloopy April 10, 2005
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Waking up in the middle of the night to take a dump or any turd laid after midnight.
"Man, I had a late dinner last night and I was flying the brown eye at three o'clock in the morning."
by Tukky May 11, 2009
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Doing your girl in the ass. As soon as you cum you pull out, pull her head around and wipe your meat across her eyes. As she tries to blink the soon to be pink eye away you say "thanks for flying (your name here) express, and launch her off the balcony.
defined: did you hear about the girl that jumped at my building last night? she was flying the red eye.
by biffduncan October 26, 2019
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