The impending end-of-days that will be brought upon the world by the rising culture of douche bags otherwise known as "Bros". While the prophecy is unclear it is certain the Jeep's with massive lift kit's blasting songs by disturbed and tool will rain down from the skies, every being on Earth will be adorned with pink polo shirts untucked with the collar popped and extended several feet, and a terrible cacophony of the words "bro" and "broseph" will emanate from no certain place but will be heard everywhere.

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.