To wear something and look cool doing it.
Look at Johnny jammin' those Oakleys!
(V) To sell drugs. Word commonly used in Baltimore
Yo the boyz got me while I was jammin up top
selling alot of, movin alot,selling out
yo i just did $2000 out here its jammin
when a place is very busy; lots of people around
on opening day, the theater was jammin