Heep-heep

"There once was a Heep-heep from Zrak Who found himself in a crack The harder he tried To remove his backside The deeper he sank and that's that!"

- Poem

Heep-heep was a creature from Zrak.

Behind the scenes
The Heep-heep was introduced in a poem in Monsters and Aliens from George Lucas, a book published in 1993. Lucasfilm employee Leland Chee, who maintains the Holocron continuity database, has indicated that information contained in the book is non-canonical.