"OH MY GAH!" is an Internet meme from 2010 inspired by Azumanga Daioh. Its origin was the twenty-fifth episode of the anime, in which Ayumu "Osaka" Kasuga dreams about meeting and conversing with Chiyo-chichi while studying in a classroom. The clip became popular online after it was posted on YouTube in 2010, with many re-uploads of the clip following, along with numerous fanmade re-creations in Roblox and in real life. PewDiePie watched the original clip in one of his videos.