The Greek word 'borborygmus' ("bor-bo-ryg-mus") is onomatopoeic for, as Pooh says, "a rumbly in my tumbly"...  Rumbling and gurgling noises in the abdomen.  Both borborygmus and borborygmi were already taken as URLs, so I added the suffix '-osity'.

It's also fun to see the look on somebody's face when I say, "borborygmosity dot org".