This whisper comes from They're Off, a Goofy cartoon released on 23 January 1948, where a small mixed group is heard mumbling in a funny, indistinct way. In its original context it was background crowd noise rather than a line of dialogue, which is why no words stand out. As a sound effect it has since been shared on soundboards as a piece of cartoon atmosphere, valued because it is instantly recognisable as whispering without carrying a meaning. That flexibility keeps it useful for memes, edits and comedic scenes that need a hint of gossip or a hushed crowd.