piranha effect

The term for when a guy gets a girlfriend and immediately becomes desired by other girls. It is a sociological phenomenon involving social status, showing that the man is okay to be desired. He has been approved by a sociological microcosm as a man who would make a good mate. It also involves competition, the guy is almost a prize now, something that can be won in a competition.

Once one piranha bites, they all swarm.

Single guy walks down hallway, girls barely notice. Guy gets with hottie and now girls can't stay away.

Guy's Friend: Man, the piranha effect worked wonders for him!