1) When a man drapes his testicles over a woman's eyes, places a flashlight up to his spread testicles and flashes the light on and off repeatedly.

2) When a man is getting a blowjob from his partner, and shines a flashlight deep in the woman's vagina in an attempt to light the blowjob from the inside.

Briefly, "the realization that each random passerby is living a life as vivid and complex as your own." Originally from the Dictionary of Obscure Sorrows, which has a lot more beautiful neologism definitions like this you might enjoy.