A deep knowledge and/or an educational kolification on any given subject will earn you the title of 'export' on that subject. It means you are an 'expert'.
You can be an export snake-catcher. Or an export mechanic. A kalari export. Or export in samskruta. Maybe even a Condom Physsics export. Or an export Mathematician like O.P.Sinhal.
If you are not an export in anything, that means you are jesst one nonsense fellow, and then and there itself I will take out your drishti & do felicitations for you with a money garland.
That Suma's son Krishna Kumar is there no? Hes an exxxport in Import Export Business
i blivv! Shall we take his advise for Madhavi's higher-stedies-plans in abroad?
Dad: Oho. Like that if you see, I am export
Idiotica. Never in 40 years have you asked me for advice.