Person 1: Bro do you row at Conshohocken Rowing Center?
Person 2: Yeah of course I do
Person 1: Ah dang I row at Whitemarsh
Person 2: Yeah I could tell; you're a senior and still pull in the 7:10s
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!