I think I remember reading on here one time that BPs do fart sometimes... Is it/can it be loud?

Cuz I think my BP just let one rip, and it was LOUD, no exaggeration... like taking a bucket of noise putty and smashing your fist in it >.<

I'm a little concerned though because after I realised it was coming from Dannie's cage, and freaking out a little while I got the lid off, there was a little bit of brown liquid which is undoubtedly poo, but it wasn't solid nor a very big spot. Just wondering if it's fine? Could it be diarrhea (if they even get that)? I would assume a fart that loud has to produce something so not sure if I'm worry over nothing... I guess I'm just a little shaken up by the thunderous boom