Definition

A simple greeting that serves as an existential threat to introverts everywhere, triggering an immediate fight-or-flight response. It's the social equivalent of jumping someone with a surprise hug.

Example Usage

When that stranger said 'hi' to me at the coffee shop, I suddenly remembered I had an urgent appointment in my car.

Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=hi&defid=14671887)