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 My try.   "buysam" seems mispelled.     If it is "Ben Büyüysam, Sen Nasılsın"  = "if I am growing how are you"

I think buysam is a contraction of some other words, maybe someone else will recognize it.  

Literally this means.  "If I am that how are you".   But it "feels" like this must be "(If) I am great how are you"

That would be "ben büyüğysem Sen Nasilsin"

ben bu isem= ben buysam... : if I am this...

But that doesn´t make sense yet.

Seems to me it is a reply to someone calling them a name, or saying they have behaved badly.

If that is what I am, what about you?

e.g.

You are a pig!

If I am a pig, what are you?

implying you are worse than me...

Hi