This word might mean different things to different people, but growing up in Nigeria and buying things from my Igbo brothers has made it mean something extra to me.
Here is what comes to mind when i think of the word AUTHENTIC
Oga see this won
Oga see authentic here
Nwannem negodu this won is authenic eemported
Tah! My friend, this thing is fake jor…
It’s China something…
Oga na lie oh…
This won is the original China won…
See nah…
*Bends shoe into amazing contortions*
See as e strong…
Oya how much?
Because of you oh,
Oya bring tiri faive
Oga I no give you prize oh…
Oya bring 2k, let me just sell
I will give you one faive…
Take.
Oga e no good oh.
Make am won eight
abeg, make my oga no flog me
Oya take, give me my change
Oga tank you oh!
The shoes spoils the first time it rains when you’re wearing it.
The End.
Jesus_Freak 
That is true. When you buy things from Igbo guys like that, it doesn’t last.
Yes, unless you know enough about the product to identify fakes, and make them bring out the originals inside their shop