What is top of the rock?

When you give a guy top while you have pop rocks in your mouth

Excuse me madam, would you care to give me some top rocks?

Top of the rock - what is it?

Getting your dick sucked and/or Licked with your balls included.

I offered this guy at the club last night a Sloppy Top On the Rocks.

The high from smoking the first crack rock of the day; or the act of smoking the first crack rock of the day

I'm totally riding the top of the rock.