'Don't Be a Greedy Bastard'

I would LOVE to find the song that Whoopi Golberg, Robin Williams and Billy Crystal sang. I don't know if the first line is also the title, but I'm sure most people remember the first line "Don't Be a Greedy Bastard" and the words
"grey poupon" which always got a huge laugh. I remember the tune and would love to find the lyrics or the song again. Any good hints? They sang it in one of the earlier shows, late '80s, when they were helping the homeless. I,ve
still got the t-shirt!