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Ayumu Kasuga is a fictional high school character from Azumanga Daioh animated series. She is often called by the nickname "Osaka" by her friends, the city Ayumu is transfered.
Oh Mai Gah / Oh My God
"Oh Mai Gah!" is an Engrish exclamation from the 25th episode of Azumanga Daioh. While Osaka is dreaming, she encounters a yellow cat that appeared outside the classroom window. In the Japanese dub, the cat speaks to Osaka "Hello everyone. How are you? Fine, thank you!" and Osaka responses with the exclamation that is "OH MAI GAH!".