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Cas is a short form of the word casual. It is used mostly in hip settings where you or the people you are with are enjoying your time.
It's a cas vibe right now!

or

I'm feeling pretty cas today, anyone want to grab some drinks?
by The Cas Man December 18, 2018
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2
Creativity, Action, Service.

It's the part of the IB program that's supposed to make you well-rounded. You have to get 150 hours of them in your two years.
You only have 100 CAS hours? The deadline is tomorrow.

Yeah, I have 8 more CAS sheets to fill out. Will you sign my supervisor's name?
by that nerd girl April 23, 2006
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3
short for casual (sounds like the first half of casual)
by lauren September 01, 2003
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4
Military abrieviation for Close Air Support.

CAS runs are usually made by gunship helicopters, the first CAS runs were made with UH-1 Iroquois Huey helicopters fitted with rocket pods and grenade launchers, the AH-1 Cobra series helicopter has been used from vietnam to current date for CAS roles.

Other helicopters can provide CAS, AH-6 littlebirds, AH-64 Apaches and AH-60 Blackhawk gunships can be used to provide CAS.

Note the lettering in the chopper names, the H mean helicopter, A means assault/attack, U means utility/transport.
"We got a Cobra inbound on a CAS run to light up the tree line, after all the FFARs have hit we move in."
by MarineJulio April 06, 2005
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5
Abreviation that stands for confidence, appearance, and swagger. The result of having CAS is an emitted aura from one's body like when Charlie Murphy met Rick James. When you have all three, people will think you are walking down the red carpet everywhere you go.

See Al Pacino & Denzel Washington
Guy: you missed it today, my CAS was off tha hook!
Fag: even if i was there i wouldnt have seen it...
Girl: oh burn!
Guy: well is it my problem that youre so big everyone is forced to see you?
Girl: ohhhhhhhhhh!
Fag: thats for me to know and you to find out
Girl: oh baby!
Guy: thats not even the right context
Girl: uh huh, uh huh!
Guy: girl, stop touching youself in public
Girl: im almost done!
by Ryan Jackson December 03, 2005
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6
term used to describe a guy who turns more than 25 percent of the girls he has sex with into lesbians
Hey man did you hear that Tom just cassed the big girl in biology?
by Mac31 March 25, 2011
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7
A shortened version of the name Castile, and angel who despite being so gay for dean makes all the girls swoon
"What's the word Cas?
"It's a shortened version of my name.l
"..."
via giphy
by cassbutt February 26, 2017
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