to take a key or other sharp object and scratch the car of a person you hate, leaving scars in the paintwork that look shitty and cost a ton to have fixed
"man, i can't believe michael hooked up with clara after i told him i liked her. let's go key his car!"
by lauren August 31, 2003
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verb, to scratch the paintjob surface of a car.
I had my car out of storage for just 3 days, and some dickless piece of shit had the nerve to key (ones) car.
by nick_g July 1, 2010
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The result of being a douchebag.
To key (ones) car:

Bro 1: Oh meh godd bro someone totally keyed my sweet ford f150! My dad is going to kill me!

Bro 2: People must just be jealous of your killer ride.

Intellegent Person 1: Or, you're just a complete asshole.

Bros 1 and 2 (tandem): OOOOOHHH Yeeeaaarrrhh
by Corkit August 4, 2011
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