Definition

A late-night Cartoon Network programming block that aired after 10 PM when parents assumed kids were asleep, eventually throwing in the towel with a 'watch it or don't, we don't care' attitude. It was the gateway to anime and adult humor for millennials everywhere.

Example Usage

Back in the day, sneaking downstairs to watch [as] at midnight felt like joining an underground resistance movement.

Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=%5Bas%5D&defid=18203388)