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When a passenger falls asleep as soon as the vehicle begins motion.
"The baby has car butt. Take him on a drive to put him asleep."
Car Butt by Keybo4rd_Warri0r July 13, 2013

Ethereal Car Button 

A button especially designed into the Nissan Murano. It enables the car to have 0 collision with objects around it, so that it cannot get into a car crash. Its other uses include, but not limited to, pulling out of a garage when someone has blocked you in, preventing hitting trees, and driving wrecklessly. The button can also be unattached and used by individuals for various scheming.
Randy took out his Ethereal Car Button (ECB) from his car and randomly started walking into peoples houses. By the time the cops came, Randy was already gone. Using this product for these means is usually scorned down upon, but totally fun anyways!

carbutthole 

A play on the word "carbuncle". It means to be a boring virgin who bitches a lot and licks the buttholes of rich fat man in the back of their cars.
I saw a carbutthole get out of a car yesterday with a wad of cash, after he licked that rich man's butthole.
carbutthole by I Hate Angela November 2, 2016

carbutti 

someone with a ass as big as a car such as anna carbutti
dam i wish i had a carbutti ass
carbutti by hank hill gill June 16, 2012
Woah she’s rly carbutt
carbutt by User2627282882 October 14, 2021