When a someone puts one cock infront of each eye (like binoculars) and pulls their foreskins over the back of their eyes, then he/she grabs the shafts and jerks them off .

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.