Sweet Jamz is a catch-all phrase. It describes either a) music that totally kicks ass--whatever that may mean to you (except the Jonas Brothers, which could never be considered sweet jamz), or b), more commonly, any thing, person, place, occurrence, event, situation, eventuality, or outcome that is considered to be positive.

Etymology: probably the '70s. Brought to current vernacular by the residents of Mod 30.

When you eat dirt for the first time and leave your family to build a shack in the woods