A sexual position in which the male inserts his penis into his partner's vagina and proceeds to curl back upon himself, grasping his ankles with his hands to form a human "wheel." This position ought to be held for a period of no less than 10 minutes, after which the rider dismounts and no one is satisfied.
Linda: Are you coming to my bat mitzvah potluck this weekend?
Donna: Hell no, Linda, I've a got dick unicycle to ride.
Linda: Is the dick unicycle really all it's cracked up to be?
Stuart: Hell no, Linda, I have really weak wrists
Linda: Why is Stuart all covered in mud? Did he fall outside?
Donna: Hell no, Linda, we were doing the dick unicycle in the rain
The response you give to a nosey person who's always asking dumb questions about your sex life
Linda: Have you been a good girl lately?
Donna: Hell no, Linda, I've been riding dick unicycles on the daily
Interviewer: Are you willing to work nights and weekends?
Stuart: Hell no, Linda, nights and weekends are reserved for dick unicycles