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1.
CAS
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!
de Ryan Jackson 3 décembre 2005
 
2.
CAS
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?
de that nerd girl 23 avril 2006
 
3.
CAS
short for casual (sounds like the first half of casual)
"dress for the party is cas"
de lauren 1 septembre 2003
 
4.
CAS
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."
de MarineJulio 6 avril 2005
 
5.
cas
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?
de Mac31 25 mars 2011
 
6.
cas
cas is an acronym for Cool As Shit.

(it can be pronounced as it looks w/ a 's' at the end, other accepted pronunctiations are like caz w/ a 'z' sound at the end)

it often refers to people, events, and other items that have the possiblity for being Cool As Shit.

being cas is a prestigious title. use it wisely.
Ex1
Bradley: "Hey man, didn't you hang out with Kelsey this weekend?"

Dustin: "I did dude! And she is defiantly cas. I dont think there is a girl out there that cas."

Ex2
"That movie the hangover is one cas movie. I might just go watch it again"
 
7.
cas
meaning dope, nice, and sometimes desirable.

laid back
{1} "yo dude, check out my new stereo"
"oh.. word.. thats pretty cas bro"

{2} "this party is pretty cas"
de lookitzlyssa 10 juillet 2008