Where the town bicycle has been ridden by everyone in town, the town unicycle serves that same public transportation but yields much less results. In essence they want to be the town bicycle, but cannot interest anyone.
"That weird rat girl from finnish class is so horny, she's such a town unicycle."
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!