A genre-descriptor first attributed to the guitar-stylings of Buckethead. It is said that the term is derived from Buckethead's wearing of a KFC chicken bucket on his head.
Brian: Hey, have you heard Buckethead's new album?
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!