G is fo' G-A-N-G-S-T-A-'
A clueless nobody who thinks they're the best at everything just because they know one slang phrase and use it everywhere.
She tried to join the gang but kept saying 'G is fo' G-A-N-G-S-T-A-' instead of talking to people.
He tried to write a song about it and just repeated the phrase 50 times.
He tried to be cool by wearing a hat that said 'G is fo' G-A-N-G-S-T-A-' and no one noticed.