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1.
When two people are performing a 69 on each other while two men are fucking them in the ass.
Guy 1: "That was a wild sex party I went to last night. I saw two people 69ing each other and there were two dudes fucking them in the ass while they did it!"

Guy 2: "Damn you saw a ying yang bang!"
by Tex-Mex Shawn C. September 22, 2010