It was either a very enthusiastic wave that looked like a Nazi salute, or it was literally a Nazi salute. The real question is whether it was genuine or not. I'm leaning towards the side that Elon is basically just a thread from 4chan brought to life and he's just trolling, but who knows.
Discussion
Why don't you watch the video and see for yourself?
He said I give my heart to you, then he gestured as if to fling his heart
Then all the mental midgets yelled NAZI.