"yillin" aka chillin (-ch+y) ... is the act to chill, relax, let go, get buzzed, whichever term you prefer. Yillin most often is meant for getting high and doing nothing all day except for laying on your couch and listening to music. However, yillin can also mean to hang out with a group of friends and get high, drink, chill, etc, etc.
We are yillin
The number of -Ls at the end of the root, yill-, stress the level of yill one is trying to achieve; as to give others an idea of what kind of night they are getting themselves into.
I'm finally finished with that 12 page paper I've been working on all week, can't wait to go home and yill real hard.
Dude, come over to my place tonight. We're all planning on yillin.