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A stupid thing people say to each other when they're bored and don't want to talk about anything real. It’s like a dumb joke from a song that no one really understands but everyone still says.
'I am the walrus. Coo coo kachu.' Dave said while eating a sandwich at lunch.
'Coo coo kachu?' Sarah asked, because she didn’t know what that meant and was too lazy to ask.
During a boring class, Jake said, 'I am the walrus. Coo coo kachu.' just because he felt like it.