A group of nerds that meet on the third Sunday of every month and talk about Harry Potter in Philadelphia. They are nerds, and the discussions often deter to even nerdier topics like Lord of the Rings, etc.
Person 1: Hey you, do you think Harry Potter is the 7th horcrux?
Person 2: What the fuck is wrong with you? Go to a Potterdelphia meeting.
Person 2: What the fuck is wrong with you? Go to a Potterdelphia meeting.
by Filius Flitwick January 22, 2007