Brown burp 

When you burp and throw up in your mouth a little.

Oh man, brown burp. That one burned.

Brown burp by wargy2 August 29, 2019

brownburg 

when you take a dump and the turd is sticking out of the water a little and smells really bad because of it.

dude, i just took a dump and there was a smelly ass brownburg.

brownburg by Jill_L September 26, 2006