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10.
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
 
1.
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
 
2.
cai
a sexy son of a bitch
enormous penis
sex god
testicles hold gallons of spunk
always shagging
that dudes a right CAI!!!
by cai March 04, 2004
 
3.
Chinese American International School: a smallish, independent bilingual school in SF- specifically the hayes valley. Kids there are smart and rich.
Person 1: where do you go to school?
Person 2: CAIS...it's a blah blah blah (launches into explanation)
Person 1: so is everyone there chinese?
Person 2: no, only half of us.
Person 2: the other half of us are half asian or white people who decide to learn chinese.
Person 1: oh....cool.... so you speak chinese?
Person 2: yeah. (to self: duh)
by xyzpseudonym2 November 02, 2010
 
4.
Cai
A sexy, amazing , caring, loving boyfriend
I love Cai! <3
by CaraBrookelle January 25, 2011
 
5.
Chinese American International School, a small bilingual school in San Francisco.

People who go there are known as the Rich CAIS Kids.
1. I go to CAIS.
by TOERTELLEHNI November 28, 2010
 
6.
Cai
A cunt
Also has a very tiny penis
Girl 1: I had sex with this guy last night, but he had a tiny penis

Girl 2: Ah, must be a cai
by Y Geiriadurwr December 10, 2013
 
7.
cai
can't afford it
Guy 1: Can you afford a taxi? Guy 2: CAI
by lad6911 March 17, 2014