The Horribly Hazardous Heffalumps is the first original song heard in the film Pooh's Heffalump Movie. It is performed by Pooh, Tigger, Rabbit, Piglet and Eeyore (mostly Rabbit and Tigger) as a direct response to Roo's question, "'Scuse me, what's a heffalump?" In the song, they outline the many horrendous qualities that they believe heffalumps to have, such as that they have "fiery eyes and a tail with a spike" and that "they'll steal all your honey and eat your last crust." At the end of the song, Pooh and the others crouch together, thoroughly terrified, but the song only excites Roo, who decides that he wants to try to catch one. Later in the film they all learned that none of these things that they believed about heffalumps were true, though Roo was the first to find out. He discusses many of the supposed attributes of heffalumps that he heard in the song and Lumpy says that he'd like to have a tail with a spike.
This song and the visuals that go with it likely drew inspiration from the classic Pooh song "Heffalumps and Woozles," though due to its somewhat whimsical nature, the images actually presented in "The Horribly Hazardous Heffalumps" are rather less scary by comparison. The characters perform the song with a group of three backing vocalists: Randy Crenshaw, Rick Logan and Bobbi Page. The music for the song was written by Carly Simon, the lyrics by Brian Hohlfeld and the song was co-arranged by Martin Erskine and David Slonaker.