A special condition in which you or any of your friends has a special attraction to fat girls or BBWs (big beautiful women). Symptoms can last as short as 1 week to as long as a year. BBW Syndrome is contracted through hanging out with other people with BBW syndrome.

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.