Can somebody tell me what "Masaka" means?

I've been looking over the whole internet and they give different answers! So please, what does it really mean?
 Mushii posted বছরখানেক আগে
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জাপান উত্তর

Nayuki-chan said:
It either means "It can't be" অথবা "Unbelievable"
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yuuram said:
unbelieveball
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orochimarux said:
it means could it be ব্যক্ত that 难道是/说
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I_luv_stitch said:
My friend always cals me a masaka I wasn't sure what it means but now I am not sure if he knows what it means he told me it ment নিড়ানি, hoe but I have been told it means অবিশ্বাস্য I have come to the conclusion that masaka means অবিশ্বাস্য
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