Someone who goes to church only on certain holidays and for certain occasions (Easter, Christmas, weddings and funerals).
This type of person may or may not be ghetto themselves.
"Today is Easter Sunday...the last time I came to church was Christmas of last year.....does that make me a ghetto christian?".
"This wedding is the beautiful.....this is the fist time I've been to church since I got married three years ago....I guess that makes me a ghetto christian".