Brown Snake Moan 

Brown Snake Moan- (Verb)
The moan or groan of satisfaction given after producing an especially large poop.

Jerry: "Oooo-AHHH!"
Phil, said while knocking on the bathroom door: "Damn, that was a downright Brown Snake Moan!"

Brown Snake Moan by Gitche-Man March 19, 2017

Brown snake moan 

The cry of agony that accompanies a particularly painful bowel movement.

"I don't know what i ate last night, but I definitely had the brown snake moan this morning."

"I had the brown snake moan so bad I swore it was coming out sideways."

Brown snake moan by J.Teezy November 28, 2009