I can do that pretty well on the exhale, but no way for me on the inhale.
It sounds more like a dragon purring than a housecat but close enough.
You can learn with a straw and a glass of water so no need to find or purchase a didgeridoo, though they are fun to play.
OK, with the obligatory jingoism out of the way: that's quite interesting. And having heard a long note held for some time, I'm embarrassed not to have realized this on my own.
The purring sound here though comes from too far back to make that work, I can't get air to pass through that part.