Boomer Mother Fucking Sooner.

This expression signals your allegiance to the greatest college football program on the planet: the Oklahoma Sooners.

"It's gameday, y'all; BMFS!!"
by Robert Stoops I September 14, 2014
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stands for bad motherfucker. popularized by Samuel L. Jackson in the movie Pulp Fiction. I also heard you can see it on Mace Windu's (also played by Samuel L. Jackson) lightsaber in the star wars movies.
Give me my wallet back. It is the one that says bad motherfucker on it.
by David Winokur May 17, 2005
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