It's a word that has endured surprisingly well, as slang goes. And it's a conspicuously egalitarian term. You'll find it used in both blue-collar and white-collar settings, and across racial lines. There's very little tribal attachment. Nobody cares if you appropriate it. The general sentiment is the more jawn users, the better.
But unfortunately, I'm afraid it may have jumped the shark when the "Jawn Morgan" billboards started appearing:
https://billypenn.com/2022/05/25/jawn-morgan-billboards-phil...