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またまた

again, once again, come on, you're joking

m a̠ t a̠ m a̠ t a̠ → 又々
また also, furthermore + また also, furthermore
adverb Rare #40,461
again, once again Often conveys that something is happening yet again.
JA: またまた彼は遅刻しました。
EN: He was late again.
come on, you're joking A conversational expression of playful disbelief.
JA: またまた、冗談でしょう。
EN: Come on, you're joking.

またまた彼らはけんかをしているようです。

It seems they're fighting again.

またまたご冗談を。

Oh, you’re joking again.

またまたうれしいくせに

There you go again, acting like you're not happy.

— バトル・ロワイアル (2000)