Ronda Rousey Inks Movie Deal With Tina Fey ... 'Do Nothing Bitches'

So much for Ronda Rousey's movie career being D.O.A. -- the UFC superstar just locked up ANOTHER gig ... in a movie based on a catchphrase she created, "Do Nothing Bitches."

Rousey will star alongside Tina Fey -- playing a hard-ass instructor at a camp for pampered rich wives ... according to Deadline.

Seems like the plot will be something along the lines of ... "Do Nothing Bitches Become Do Something Bitches."

Rousey popularized the phrase last year -- saying a "Do Nothing Bitch" is a woman who just tries to be pretty in the hopes some rich guy will take care of her. She later used the phrase on shirts and Beyonce incorporated the quote in her concerts.