You've had sex with three generations of the same family. The daughter, The mom and the grandmother, or, the son, the father and the grandfather.
John had sex with his girlfriendthe other night, after already having sex with her mother and her grandmother before, therefore completing the Redneck Trifecta.
Braxton: Yo bro, so I was titty fucking this girl last night and she was all like "Braxton? What are you doing?" but it doesn't matter because I just completed Abraham's Trifecta.
Paul: No big deal, I did that, like, years ago...