μακάρι να 'ξερα → I wouldn't know, beats me, fuck knows, God knows, goodness knows, hard to say, heaven knows, I haven't the faintest idea, is beyond me, it's beyond me, search me, what do I know, you got me, you got me there

[spiros]

I wouldn't know → δεν έχω ιδέα, ιδέα δεν έχω, πού να ξέρω, μακάρι να 'ξερα