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1.
The middle man in a threesome involving three men. One who is both being penetrated analy while penetrating another analy.
Jason was the lucky peter in our gay threesome.
by questions October 08, 2007
 
2.
The middle guy in a gay man threesome.
While giving it to Ted and recieving it from Joe, Johnathan knew he truely was the Lucky Peter.
by Keithinator March 12, 2009