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 sa loob ng isang taon na ang nakalipas
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Hapon Sagot

Nayuki-chan said:
It either means "It can't be" or "Unbelievable"
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yuuram said:
unbelieveball
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orochimarux said:
it means could it be sinabi 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 asarol but I have been told it means mahirap paniwalaan I have come to the conclusion that masaka means mahirap paniwalaan
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