Definition

The verbal filler that buys you precious seconds when your brain has completely flatlined mid-conversation. It's the universal sound of mental buffering, deployed when you need to say something but have absolutely nothing to contribute. The spoken equivalent of the loading wheel of death.

Example Usage

"So, what's your five-year plan?" "Uhm... uhm... I'll get back to you on that."

Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=uhm...&defid=16954554)