The idiom chillin’ or chilling is utilized by wannabe gangsters to illustrate activities that engross relaxing; for example watching television, drinking alcohol and feeding ducks, et cetera.

The state of doing absolutely nothing and having fun doing it. Contrary to popular belief, cold chillin' does not require intoxication by weed, alcohol, or anything else.

chillin by yourself, not doing anything while awake and alone, being alone and not doing anything while not being asleep,
just hanging out by yourself maybe on the internet or playing video games or watching the idiot box or all at the same time, depending on where you live in the world and the season you could be solo chillin outside as well but not being very active

Chillin like a civilian is chillin while not in the can, or pen, or up/down state, or not doing a bid. Free Walkin.

Without worry that you will be in jail.

a. The act of Chillin to the tenth power
b. Chillin in a different dimension
c. The next level of Chillin
d. Chillin to a degree that you can get in college
e. having all necessary components of Chillin within hands reach

The act of chillin to the Nth degree. Particularly in DC or the surrounding region.

The act of chillin in a slightly lunchin, or seedy manor. Particularly in PG county, Maryland, or other areas in the DMV