Vomiting while kneeling and holding onto the rim of the toilet. So called because it resembles grasping the large horizontal steering wheel of a bus.

To unintentionally drive a common route. To turn on the mental autopilot and arrive toward a location other than your desired destination. For example, if you set out to drive to the store, but after a few minutes find that you are halfway to your place of work.

To throw up into a toilet, with a death grip on the toilet seat at the 9 and 3 position as if it were the steering wheel of a bus. Most commonly done after drinking excessively.

Holding onto the toilet bowl while vomiting. Also known as "driving the porcelain bus".

When having sex doggystyle, the male inserts a thumb in the anus and turns his hand to resemble making a turn while driving a bus.

The act of having sex doggie-style, where the man's hand is resting on the female's lower back or upper rear-end. The combination of the two often results in a motion which resembles using the large steering wheel on a school bus.

To vomit kneeling in front of the bowl of a toilette. Because you are holding the bowl with your hands, it looks like you are driving a bus.