to Americanize, to make less fobby or Asian.
to make cooler and less nerdy.
To take off the Asian of someone.
Chen Chen was defobitized by his wonderful little sister; he stopped getting Cantonese haircuts and even made friends other than his graphing calculator.
To make something less FOB-by.
To make a lame person cool.
To improve someone or something.
Pey Ong Mei changed his name to Peter, wore gangster clothing, and learned some slang in efforts to defobitize himself.