Not quite funny. Generally used when making fun, or talking about making fun of something in an off the wall sense. When you weren't present, You had to be there moment. Humor in the sense of outside the box.
ha ha that was willarious (not quite the normal punchline, so it took me a second to catch it)
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!