Diarrhea the morning after drinking a lot of beer.

drinkin a brew while takin a poo!

Noun (poooo broooo)

Poo brews are farts that occur when a turd has formed in the butt-chamber, and is waiting for departure. The gas from your body has to pass through this turd which acts like a filter made out of shit. Thus causing the fart to smell extremely bad

When you can feel that you are going to have to poop later on in the day, and you can just feel it brewing up in your gut.