Being really excited about achieving something individually, but failing and showing public disappointment. Like Paul McCartney trying to catch a free t-shirt at a Brooklyn Nets game in December of 2013.
Did you see that guythink he could jump over that railing, try, and bust his face? Totally PMTCATS. He was so butt hurt.
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!