Someone who is completely off their rocker. " you seen Virgil these days?" Nah mate and seen in him in a while" the mental cunt was shouting a pigeons in town"
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!