Green’s Dictionary of Slang

606 adj.

[? visual pun on fellatio, as a var. of sixty-nine n.]

(US) a euph. for homosexual.

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[US]L.A. Times 14 Nov. II 8: [Lowe] came [into the room] again, while I was lying on the bed. He asked me if I had ever heard of the Six-O-Six Club and the Ninety-six Club. I said I had not. He said that the Ninety-six Club was the best; that it was composed of the ‘queer’ people, that got together every week.