"What's going on?" is an idiomatic expression either used as an informal greeting or as an expression of concern awaiting an explanation. 1.) Informal Greeting: "A: What's going on? B: Nothing much." 2.) An Expression of Concern: "A: What's going on? B: There was an accident!"

As in, what's up? What's happening? How's it going? Bob: What's Going On? Fred: Nothing much.

It means: "What's happening?"

Что происходит?

What's happening?