Definition

A casual, laid-back way of saying 'no,' popularized by surfers and people who refuse to sound overly formal about their refusals. Pure anti-establishment vibes.

Example Usage

You coming to the corporate retreat? Nah, fool, nah. That sounds like the opposite of fun.

Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=nah&defid=13570)