From Jonathan Dee, “Neither Straight Nor Outta Compton: Performed by gay and transgender rappers in New Orleans, the fast and profane music known as sissy bounce creates an atmosphere of sexual liberation — for women”, NYT Magazine, July 25:
The women did not dance with, or for, one abnother — they danced for [transgender rapper] Freedia [pronounced "FREE-da"], and they did so in the most sexualized way imaginable, usually with their backs to her, bent over sharply at the waist, and bouncing their hips up and down as fast as humanly possible, if not slightly faster. Others assumed more of a push-up position, with their hands on the florr, in a signature dance whose name is sometimes helpfully shortened to “p-popping.”
That’s the P-word, folks, P for pussy, in case you didn’t get it.
I can see brevity as a motive for the abbreviation, but in the context of really raunchy language and highly sexualized dancing, the word seems, well, unduly modest.