Definition

A nonsensical sound uttered with exaggerated enthusiasm specifically designed to confuse and amuse children—essentially the audio equivalent of pulling a ridiculous face.

Example Usage

The entertainer shouted 'Nahardiaaaa!' and the entire room of kids erupted into uncontrollable giggles.

Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=naharda&defid=2579596)