illin' 

1) Trippin', acting erratically or inappropriately.
or
2) Having fun, or messing around.

1) My parole office is usually cool, but he started illin' when I told him I was back to shooting heroin and pimpin' hos.

2) Me and my boys was just sitting around illin'...

illin' by buddhablaze January 28, 2003

illin' 

Remarkable, outstanding, astonishment

Dude.. them jeans be illin'

illin' by The Chow Man October 21, 2004

illin' 

to be acting lame.

usually a pretty dope person acting totally whack.

something a hater does.

Dirty Dan: BababaBiyatch, hows it crackin baby bizzle?
Charisse: Shut the fuck up; you be illin' douche packer.

illin' by Ambassador-C May 24, 2008

illin' 

The act of hatin on somebody.

Shaniqua was illin' me for dressin better than her.

illin' by Aramel March 31, 2009

illin 

going crazy/buggin

You know the moon isnt green are you illin!?!?

illin by Soledad July 23, 2003

illin 

A word used to describe something that is both "sick" (amazing) and "chilling" (relaxed). Synonomous with "epic" and "legendary" although with a somewhat more relaxed connotaion.

Yo brosif, that headshot was straight illin like a villain yo!

illin by CandyMan77 March 25, 2009

illin 

Something pirates and theives and beastie boys do well and often.

"Most illinest b-boy - I got that feeling
I am most ill and I'm rhymin' and stealin'

illin by jim December 30, 2005