She’s big, she’s baudy, and we once saw her serenade/abuse an audience member and then sit on his face. If you’re sitting in the front row of this cabaret-on-crack act, you’ll probably see things you can’t unsee, and good luck getting the beer out of your clothes. This is a special preview of “Rock Bottom,” a show co-written with Adam “Ad-Rock” Horovitz of the Beastie Boys, among others.