Jackson is a funny guy who is the nicest person you will ever know. He will listen to you when you talk, and answer any questions you have honestly. He always greets you with a cheerful smile. He will be your best friend, and not know it. If you are lucky enough to have a Jackson in your life, hold on to him tightly!

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.