I read an article as I was looking for the answer, and the article mentioned the liposuction too, but not what the name of the episode was. (so you didn't imagine it! ) Other than that, I can;t find it either. I found a link to all the Freddy's Nightmares episodes, and I will put it here in case the title of an episode jogs your memory (or the date it aired).
http://www.findinternettv.com/Video,...ightmares.aspx