Christine Lavin came out with "Cold Pizza" and "Sensitive New Age Guys? in the 1980s, I think. She has changed "Guys" over the years. Has she made changes to "Pizza," or doesn't she sing that one any more?
Poor Herman is long forgotten, and nobody's likely to get that joke any longer.
But cold pizza is still the Staff of Life, so the song must go on.

-Joe-