Second Hand Jamming- listening to others music blaring through their car speakers as an alternative to your own. In rare cases, SHJ has been known to cause accidents when attempting to follow another vehicle too closely in order to enjoy their tunes.
Dude, you gotta get a handle on that SHJ. We all love 'Friday', but you've really got your bumper up his ass.
by Webster's b**** March 17, 2011