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1) Trippin', acting erratically or inappropriately.
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'...
by buddhablaze January 28, 2003
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Aug 6 Word of the Day
Used often in the business world, this incredibly versatile phrase can be literally translated as "fuck it."
The client changed the deadline to today? Well, it is what it is.
by A. Danish November 27, 2007
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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!
by CandyMan77 March 25, 2009
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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'

by jim December 21, 2005
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Doing stuff you shouldn't be doing (aka bad shit) while hanging out with friends, like drugs or vandalism.
Donna: "What are the plans for tonight, Fred?"
Fred: "Oh Hangin', Chillin'.... Little bit a illin."
by Shannie January 04, 2006
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