What does Brain Salad Surgery mean? Is it slang?

Yes. This is slang for fellatio, i.e., oral sex with a man. If you look closely at the Giger painting of the woman on the inside of the cover of the Brain Salad Surgery album, you may notice a "ghost" of the head of a penis on her neck.

When asked what Brain Salad Surgery meant on the radio show "Rockline" in 1992, Keith Emerson jokingly replied:

"Er, it means the same thing as 'Whip Some Skull On Me.' I don't know what that means. Do you know what that means?"

Jim Smith, smithj@sl9.sr.hp.com