Something that isn't even close to as stupid as whatever someone else has just said.
Person 1: "Coronavirus is completely government created! They're trying to cover up the fact that the 5G that is currently being deployed around the world is killing people!!"
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!