A phrase used when you are not really paying attention, 
but don’t want to give it away

Burt: I went to the coolest country concert last night and Dolly
Parton was rocking so hard her boobs almost felt out.
 Johnny: Right on!


or


Like “ok”- a positive response to an event.

Friend: The Polke exhibition at MoMA was one 
of the most impressive I’ve ever seen 
You: Right On!


or 


Friend: Dude, I’m getting some really good herb today!
You: Right On!


or


Used to express solidarity.

Guy: Being black isn’t easy, right?
Rakim: You’re not black dude!
Guy: Right On!