your guess is as good as mine
US /jʊər ɡɛs ɪz æz ɡʊd æz maɪn/
UK /jʊər ɡɛs ɪz æz ɡʊd æz maɪn/

1.
tebakanmu sama bagusnya dengan tebakanku, aku juga tidak tahu
used to say that you do not know the answer to a question, or do not know what is happening, for the same reason as the person asking
:
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Why did he leave so suddenly? Your guess is as good as mine.
Mengapa dia pergi begitu tiba-tiba? Tebakanmu sama bagusnya dengan tebakanku.
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When will the new policy be implemented? Your guess is as good as mine.
Kapan kebijakan baru akan diterapkan? Tebakanmu sama bagusnya dengan tebakanku.