A nice tall person that looks into others and can feel their pain just by their expression. He tries his best to make everyone happy and to keep a smile on someone’s face. He’s very funny and loves cracking jokes to make people laugh. A person who smiles a lot also has many secrets to keep his loved ones happy. People may not see it but this person is going through a lot. More than you’d think.

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.