The ahooga comes from the klaxon horn fitted to early 1900s cars, whose two-note honk became a staple of classic cartoon sound libraries from Hanna-Barbera and Warner Bros. It was reused for decades in animation for chases, crashes and lovesick reactions. Ren & Stimpy, the Nickelodeon series that premiered in 1991, helped revive the effect for a new generation with its exaggerated expressions. Clips and edits later carried the honk to meme videos and soundboards, where it remains a shorthand for cartoon attraction.