This meme sound comes from the Jimmy Neutron franchise and is tied to Carl Wheezer, a character whose awkward crush on Jimmy's mom became a long-running internet joke. Short clips of Carl saying or singing about "Jimmy's mom" spread widely through YouTube meme edits, remixes and reposts, then carried over into TikTok and short-form reaction videos. It stays popular because the voice is distinctive, the setup is instantly understood by many viewers, and the line works as a very fast punchline in nostalgic cartoon memes.