So what are exactly are the laws for indecent exposure in NJ? @Carson
http://www.ocalapost.com/pullem-up-pay-up-or-go-to-jail-no-more-saggy-pants-its-the-law/
Reasonableness standard. If you hang your junk out in a location where it would be reasonable to expect to be seen, even in passing, then you are guilty of lewdness. A public park/public parking lot would certainly qualify.
Props to @soulchild who got me hooked on this:
http://www.thenopeek.com/