Similar to the town bicycle, except this girl is always seemingly being ridden by an ass clown.
Hillary is hot but she's the town unicycle, no telling how many clowns have rode her around.
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."