A dating preference in which a man has three options simultaneously. These Consist of one woman that he's been dating for a while, and about to end a relationship with. The second one he's been dating for a shorter time, and everything is going well. The third and final one is just starting out, and beginning to blossom. And Tah Dah! The M.O'Connor triangle.
John: Three girls at once man?
Ryan: Yeah, the M.O'Connor triangle.