I think the idea behind the song is that the singer asks an attractive woman what the fox says, and then her response, whatever it is, is implied to be the correct answer, because it is what she, a fox, indeed says.
i never actually listened to the lyrics. That’s a much better explanation than i expected. I thought it was just a dumb annoying song about how we don’t have a word for the sounds foxes make. (Or for most other wild animals. What does the raccoon say? The squirrel?)
If I went to, say, China and started making animal noises at people, I think I would be detained, evaluated, and deported in that order. 
I suspect the vowel sound that follows the “m” varies, even if it is hard for those us raised in a specific language culture to hear it (literally, we lose the ability to discriminate language sounds that are not salient in our language). The “m” sound that we all hear in cat sound though is universal early babbling, especially associated with a baby complaining, such as when hungry (and of course the parent with milk at the ready responds, hence universally baby talk for mother has a “m” sound in it …)
Interesting on the rooster. I am sure you are right about its sound not tracking into any phonemes common between languages.
Leopold Bloom’s cat in Ulysses famously said “Mrkrgnao!”
Most of them learn to meow at us in frequencies we can hear. An occasional cat doesn’t figure that out, and produces what humans tend to call the “silent meow”. It probably isn’t silent; it’s probably just too high frequency for us to hear, as cats’ hearing and vocalizations have a wider range than ours.
I’ve heard cats say something very like that.
Yes, the vowel sound was slightly different from country to country. That’s why i said, “essentially”, and not “exactly”. But they were all similar vowel sounds.
I have, too, but my current cats all sound more like “meow”. Two have a weirdly high pitched meow, but they are far from silent to humans.
But the ice would be broken, no?
It’s contextual. Better to make chicken noises while pointing at a menu than when talking to a soldier.
And, as at that multi-cultural party i went to, it is a good ice breaker. Learning animal sounds is something people do around the world, the differences are entertaining, and it doesn’t touch on politics or other potentially awkward subjects.
Squirrels chatter.
Raccoons chirp and curse.
My Siamese cats can both make the most irritating “meow” that’s long, drawn out “murffffffffffff”! Will break your brain after about 3 times.
I have a cat thats “meow” is broken. He sounds like clickety click.
Teaching children animal sounds is a way to increase their vocab and begin learning about the natural world.
It is one of the first ways my grandkids learned ASL. You make the cat sign and add the sign for making a sound. And finger spell m-e-o-w. It soon shortens to a quick sign of pulling whiskers and everyone knows you mean “meow”.
Facebook just showed me this image
From Orbis Sensualium Pictus - or The World of Things Obvious to the Senses drawn in Pictures.