[RacersEdge]

I had to look it up:

lucky pierre -- noun. 1940s. 1. the man in a sexual threesome of two women and one man. 2. (gay) the middle man in a "sandwich" of three sexually entwined men. (? -- the punchline of a joke) From "Cassell's Dictionary of Slang" by Jonathon Green (Wellington House, London, 1998).

I wonder which one he meant?