I was watching Haikyuu dub episodes and in one episode, the coach tells Asahi (one of the players): "Chop chop man bun". What does this sentence mean? I understand the "man bun" part because Asahi has a man bun. But what is "Chop chop man bun"?
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define chop chop, you get the answer I think you're looking for, "be quick!". Or are you confused about the sentence structure? I notice you're missing a comma: "Chop chop,man bun". You understand that "man bun" is synecdoche, right? If you're learning English, it might be better to ask on English Language Learners instead. You can edit to clarify if needed. For more tips, see How to Ask.