A popular dance that originated in the early 2010s, the B-Fag is performed by repeatedly pumping one's fist (or fists) to the beat of the music. It can be conducted to many different kinds of music, including hip-hop, rap, techno or anything with lots of bass. Is most effective when combined with music that only women listen to.
Look at that guy doing the B-Fag in the corner. He must be gay.