The story
As a mammoth-like creature, he has a long trunk like an elephant's, which is called his snuffle.
Etymology from Wiktionary, CC BY-SA 4.0.
Snuffleupagus
Today it means: A fictional character from the television series Sesame Street, resembling a woolly mammoth without tusks, who until the show's 17th season was only visible to Big Bird. Full definition →