v. exercising on a stationary bicycle
girl: "Baby does my butt look big in this?"
boy: turns and stares at his girlfriends ginormous butt - "hmmm, um....maybe, possibly you could think about doing some exercycling. Maybe."
Exercise through a cycling motion of the legs in the air, as one lies on their back.
"That exercycle session was intense! My buns are killing me"