Someone who critics someone else’s ability or knowledge, to a degree which becomes extremely annoying, even when the person they are critiquing has greater knowledge or understanding of saidthing.
“Don’t go to the gym with him, all he does is judge your form, total Mathew Robinson”
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!