Anime!

A fan of Azumanga Daioh gives the etymology of the word.

You may be asking yourself: “What the heck does Azumanga Daioh mean anyway?”. Well, the creator of the original manga is named Kiyohiko Azuma (Azuma + Manga = Azumanga) and the manga was first published in a magazine called Dengeki Daioh. Kiyohiko Azuma’s Manga published in the Dengeki Daioh magazine ends up being Azumanga Daioh. I have also heard it described as the Kanji used for Daioh meaning “great king” so it would be interpreted as “Great king Azuma’s manga”. You can decide which one you prefer.