From The Art and Popular Culture Encyclopedia
The Goofy holler is a stock sound effect that is used frequently in Walt Disney cartoons and films. It is the cry Goofy makes when falling or being launched into the air, that can be transcribed as "Yaaaaaaa-hoo-hoo-hoo-hooey!" The holler was originally recorded by yodeller Hannès Schroll for the 1941 short The Art of Skiing. Some sources claim that Schrolle was not paid for the recording. Bill Farmer, the current voice of Goofy, demonstrated the "Goofy Holler" in the Disney Treasures DVD The Complete Goofy. He also does this in the Kingdom Hearts games.
The holler is also used in films and cartoons in which Goofy does not appear, generally in situations that are particularly "goofy" (examples include Cinderella, Bedknobs and Broomsticks, Pete's Dragon, The Rescuers, The Hunchback of Notre Dame, Home on the Range, Enchanted and Moana).
In a Batman: The Animated Series episode titled "The Strange Secret of Bruce Wayne", the Joker performs the holler when the plane crashes toward a canyon.
The term "Goofy Holler" was first created by a user of the Internet Movie Database and originated on the trivia page for A Goofy Movie. It is now generally considered the name for the sound effect. In Epic Mickey 2: The Power of Two, however, it is referenced as "Goofy Yell".