I think it involves Bebe, since the part of the commercial in which someone says "she" should be expelled gets a reaction from what looks like Bebe's mother. Hell, all the girls are probably involved.
Outside of the satire involving the Terrence and Phillip April Fool's prank in 1998, the episode so far is basically a "one-joke" episode, with the joke not really that funny.
Wow, that episode was pretty funny/sick at times.
I like when the guys sing the song at the end and the women naming their queefs.
Overall it had me laughing alot. 4/5
I don't know, so I'll just say this: that was unquestionably South Park's best use of live-action material ever. The "women in the workplace" photo montage backed by that song was the first thing in a long time to make me laugh tears.