(n.) - The bottom parts of a woman's breasts below the nipples that are visible the bottom of a very short midriff shirt or t-shirt that covers the top of her breasts.
"If that's not a deliberate display of undercleavage on that model in the Vogue photo, I don't know what is!"
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!