Definition

That mythical sensor embedded in every traffic light that turns green *right when you arrive*, then immediately punishes you by turning red the second you commit to crossing. It's Murphy's Law applied to urban infrastructure.

Example Usage

I swear the stoparrgh is real—every single time I approach that intersection on Main Street, it goes red.

Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=stoparrgh&defid=5384482)