I lived in the boonies north of DC so by the time I heard DC/PG transplant kids using it, it was probably already old news.
We did say "bust on" a lot (more common than "joan on" where I grew up) and it stuck around longer. Even now, 25-30 years later, I wouldn't take note if someone said "bust on" someone--but the one time I heard someone my age say "joan on" recently, I gave her a grin and asked if she was from PG county. She was surprised to learn it wasn't common elsewhere.
edit: after looking into this just now, I guess it's still used farther south. Haven't heard it in the DC/MD area in years.