This generally means that you need to take a really ginormous shit; it could also
mean that you feel a shit coming on because your
butthole is
hot; another meaning is that you think you might just possibly poop or fart in someone's face unexpectedly.
"Dude, I feel a snorgum in my tummy."
"This snorgum is going to smell really
bad."
"
GET READY FOR THIS SNORGUM BITCH
TITTIES!"