A boy or girl in theirn teenage years. Tyrers can be seen wearing clothes worn by people 10 years ago and smoking copious amounts. They have no real conception of other people's emotions or feelings and the few times they do they do not care about them. They persist in making jokes and behaving like a "goon".

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.