A word drunks use to describe a "bandana"; especially when someone is wearing it in a weird way that just makes them look retarded instead of cool and no one knows how to tell them to ditch the bandana
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!