A state of butthole-to-butthole contact in which neither participant can easily disengage due to suction, fear, or sheer commitment. Considered a rare boss-level maneuver in chaotic intimacy.
If Bill at one point places his testicles into Jane's anus, he may say to her "I am rimrocking you," or he may later go on to say "I sure rimrocked Jane."
A rimrock road is the process of the passenger sitting on the drivers face, so he may receive a rimjob A.K.A.: the act of orally stimulating the external anal sphincter to cause sexual arousal, whilst the car is in motion.
I picked up a hitchhiker and as her fee, i asked her for a rimrock road which she respectfully accepted, my asshole has never seen cleaner days.