Don't worry you're safe. It's the sound of cats mating. I get it over here all the time.
It can sound quite demonic because a male cat's genitalia has spikes on it which makes it painful for the demale.
Or so I've been told, I'm not a biologist but you can look into it for yourself.
What the actual fuck man
Hahahaha spikes on genitals? Wtf? I need to research on that.