This slang phrase, as a free translation from Hebrew, is used to describe a great and wonderful thing.
Most common to be used by teens these days.

One who has a mania for music.

Comes from Hebrew (Sof Ha'Derekh) Even though it sounds negative, it's actually very positive. It expresses the feeling after having an excellent experience of any sort. You use this expression to intensify telling stories to your friends just to make sure they understand that your experience is/was way beyond good, great or even excellent, saying it cannot possibly get any better then that. It also defines something extremely beautiful. In general it intensifies the word "Best".

The best.

The road to exellence ends here.

When a well endowed man hits the cervix during sex; he's got to the end of the road.