What is Moogradbu?

By now you have all heard the latest word on the streets. 

Moogradbu!

Like, you are at 7-11 and someone is talking about the latest Viral Video on YouTube, they want to say that it's cool. 

They want to say that it's bad ass. 

They really want to tell you that you should see this video. 

So how do they describe the funniest Viral Videos ever?

Moogradbu!