When you are forced to leave a group against your own wishes and the group achieves success or happinesswithout you.
Pete best was fired form The Beatles, and replaced by Ringo Star; before the Beatles reached commercial success.
Dave Chapelle made this phrase famous in his own show.
See also I am rich, biatch, I am Rick James, bitch etc.
One funny ass motherfuckingsonofabitch, hell yeah!
So you see his show. Season 2 where he is donating money to some streetmusicans while shouting "better not bring your kids", just funny!