what does "boy friend mo ba si balong" mean?
someone message me this and i dont under stand what it says.

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In this context i think balong is a proper name rather than balong the ilocano generic term. the sentence is constructed in tagalog and in this context, what normally follows "si" should be a proper name.

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Balong is an Ilocano generic name for boys.

That could be translated as "Is this guy your boyfriend?"
You must know who is the guy the speaker is referring to.

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Is Balong your boyfriend?