An erection caused by the vibrations of a car usually occuring on long car rides, and lame scenery which sometimes causes the mind to wander and think about said vibrations.
"My gosh honey! I didn't know you were in the mood."

"I'm not, it's just a damn car boner. It'll go away in a minute."
by Cinde April 12, 2006
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(n:) a raging hard on from looking at super fucking sexy car.
example: 2010 Corvette ZR1 or

1958 Cadillac Eldorado Brougham

(if you like'em old, you know what i'm talk'n bout)
Holy Shit! I got a massive car boner from that 68 Camaro SS. I'm gonna fuck the tailpipe on that beautiful fucking car.
by Niko the Jew December 30, 2011
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When the vibrations of a car, train or plane journey cause you to get a hard on. also for further amusement - sometimes sexual, one can tightlypres the area around giving it a firm clear outline of the boner, this is then called a "Car Boner Hand Print" derived from carbon footprint.
"Dude, put that Car boner away, you're making me ill!" "Woh vibrations are getting to the lower quater, think i got a car boner coming on" "Brookes Mathews made a major car boner hand print the other day, soo clear but soo small" "Brighton + Lifton = a journey full of car boners"
by Forest Kin January 23, 2008
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Getting sexually excited from viewing beautiful cars
Gustavo caught a car boner from that Mercedes-Benz
by YoungMoneyGstack$ November 3, 2011
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An erection achieved with out desire or known arousal while driving on a long road trip. Typically predicated by a long night of drinking and little sleep.
I was driving back from a weekend road trip when suddenly I got an unsolicited car boner and my buddy started laughing at me.
by lug33 March 17, 2010
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When your sitting in the backseat and the vibrations from the road, engine, and the transmission give you a boner
I hate riding in the backseat, I always get backseat car boners
by Oujidon January 4, 2018
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The wondrous feeling of pride one gets when working on their car (e.g. changing a tire).
So I was on the freeway the other day and I got a flat. Next thing I did was pull over to the side of the road and changed it. I can safely say that I had a car owner boner for the rest of that night.
by dejaflu February 5, 2011
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