What show and which character goes "yop yop."?!

Question: The Grim Adventures of Billy And Mandy

I don't remember which episode, but Billy gets a growth spurt that comes to life, and when it talks, all it says is "Yop Yop"

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Answers: The Grim Adventures of Billy And Mandy

I don't remember which episode, but Billy gets a growth spurt that comes to life, and when it talks, all it says is "Yop Yop"

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