When a person has the effortless ability to get/pull/attract/reel in girls. It can be used to many peoples advantage. A male who has the Rubin Effect can just stand still and girls will flock to him. He is also often compared to look like a certain celebrity, adding to the effect.
Dude 1: Dude, tonight i'm looking to score with some hot girls, what do you suggest?
Dude 2: Well I have the Rubin Effect so you can throw me out like a fishing rod and then reel me in and this will in turn bring you some girls.