Usually put into calculators or other digital devices by pre pubescant 12 year old junior high students to display a message to other young children. The message, when flipped upside down, clearly reads,"GOTOHELL."
Bobby: "Johnny, I hate you!"
Johnny: "You do?"
Bobby: "Yeah! ::types into calculator, holds it up in Johnny's face::
GO TO HELL!!!"
A hardo is a person who tries extremely hard at everything. Most times a hardo will try very hard at things that do not require excessive effort. For example, sports practices, gym class, etc.
Wow did you see Jack at practice today? What a hardo!