CAI

Cold Air Intake:

Cold Air Intake Systems let your engine breathe in large amounts of cooler air, resulting in increased power at the wheels. Cold air intakes enhance the combustion process of your engine, which uses both oxygen and fuel. Cold air intake systems pull in more cold air, more cold air means more oxygen resulting in more usable power and torque throughout the engine's RPM range. Most Cold Air Intake systems relocate the air filter outside of the engine compartment or away from the heat of the engine for a cooler intake charge. Cold air is denser and heavier than warm air, which means that there is more oxygen in a cold cubic foot of air delivering a higher volume of air into the engine. Replacing your vehicle's stock air box with a cold air induction system removes one of the biggest restrictions on your engine.
Joe added a CAI to his car so his engine will breathe and perform better.
by bobhussein April 13, 2005
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CAI

It's an acronym for Cry About It. Best used after someone has told a long story about how sad and miserable their life is.
Sad KID: oh my god! I'm so depressed right now, my girlfriend just broke up with me and my parents wont let me go to the Fall Out Boy concert. I hate my life!
Person: CAI
by IhaveAnAwesomeHat April 17, 2007
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Cai

Abbreviation of "can I" that you might've used a lot
Person 1: *has a beverage*
Person 2: "yo mun cai get a swig?"
Person 1: "sure mun."
by Biggie Rection September 27, 2022
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Cai

Cai is an amazing person. Very tall and cute. He can be rude sometimes but he’s very sweet. Amit of girls would kill to have him. He loves to cuddle. He can get mad easily, don’t mess with him. No matter how many times I can say this, but he’s so adorable. When he doesn’t get what he wants he pouts. I don’t get why he isn’t the most popular guy in the school. He should be.
Girl 1: wow he’s really tall and cute

Girl 2: I call him!!!

Girl 3: sorry, Cai is already mine
by -BTS- October 13, 2019
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cai-cai

the hottest bitch that has literally ever set foot on the planet. no woman can beat this peng bbg as she is the most cute person ever
sad hoe: "omg did you see cai-cai today"
other sad hoe: " fuck yes shes so hot i wish i could make out with her"
by lovergirl266 November 23, 2021
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Cai

Cai is usually a boy with a massive shlong. He has a great sense of humour and also a great money-shot. Girls will usually find Cai the sexiest man they have seen and could only imagine to be with him.
Rebekah: i'm glad i got cai in my life he is great in bed.
by mrroadman123 January 04, 2018
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Cay

Crazy, insane or just straight up wack.
Man you cay.
That b**** was actin too cay last night.
This party better be cay or I’m finna leave.
by Cityjitt May 22, 2020
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