What is "curmurring"

Curmurring \Cur*mur"ring\ (k?r-m?r"r?ng), n. Murmuring; grumbling; -- sometimes applied to the rumbling produced by a slight attack of the gripes. [Scot.]
--Burns.

a. 1 Producing a murmuring or grumbling sound 2 flatulent; afflicted by indigestion. n. 1 A low-pitched murmuring, grumbling sound. 2 flatulence.