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!"
by Sadie007 September 9, 2011
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