borborygmic

adjective

of or pertaining to the physiological rumbling or gurgling sound from the movement of gas and fluid in the intestines

Etymology: From borborygmus + -ic.

Of, pertaining to, or resembling borborygmus; rumbling.
“They were flapping their ears, moving their great stamp-like feet up and down, grinding their teeth, slobbering with their mouths, making borborygmic gurgles and rumbles in their dinosaurian-like bodies, or throwing up their trunks or their tails.”
“They went down, stepping carefully as though in an unfamiliar place, though all of them were familiar with it, it was only The Train with its caves and dens, its mad signs pointing in contradictory directions, no help for the lost, and its seep of inky water and far-off borborygmic rumbles.”