Next time the person next to you in a meeting commits some loud stomach rumbling — you know that gurgling, growling noise that almost sounds like a fart, but because it’s internal it doesn’t carry the noxious impact and therefore is okay, but deserving of a comment anyway — say to them:
“Hey, nice borborygmus.”
That’s pronounced “bore-bore-rig-mus” and is pretty onomatopoetic to my ear.