A highly under-used form of the phrase "just chillin'", commonly used among negro and teenage folk, which is most widely known to have been used by burhanfan. It can especially be used in situations of high tension, or in response to an offensive greeting, with the result of making the greeter look (sometimes literally) like a huge cunt.
(dad walks in while young man is squirting all over his daughter's face)
DAD: What in fuck's name is going on in here!?
YOUNG MAN: Just purgin'.
DAD: Aight, cool.
BRO-SKI: Sup ya fuckin cock smokin' faggot!
BURHANFAN: Just purgin'.
BRO-SKI: Wow I'm such a cunt.
Soon after bringing in the day's mail and realizing that Donald Trump was on the cover of the latest issue of People Magazine sitting on her kitchen counter, Charlene had to put her knitting down and find the nearest incinerator. It was a real purgency.