While driving a vehicle, elevating your rear end between the head rest and top of the seat, as your partner is in back seat and repeatedly tongue punches your donut hole until fully satisfied.
Lastnight I gave Joey the best roaddonut of his life! I had him howling the whole way home.
Someone who watches another person while they are tripping on a hallucinogen to make sure they don't hurt themselves or someone else, and keep them calm if they start to have a bum trip. They usually also help the person who is drugged to interpret the experience.
The term was originally used by the Native American Church for the shaman who is running a ceremony, especially one involving peyote.
I agreed to act as a roadchief for Mike while he was dropping acid.
A common thing people get while they are on a road trip. Usually followed by nausea, or the desire to use the bathroom. When children experience this, it is common for them to say: "are we THERE yet?!!!" Parents usually get annoyed with this after a while, and start getting stressed, which leads to some tension in the car. Which can lead to bumpy driving, which leads to nausea. Sometimes, people write Urban Dictionary definitions of this whilst they have Road trip boredom.