Pen0r is a very funny word that most people dont know what it means. :O It really is an Internet way of saying penis
but most people dont know, so you can write it on the schools whiteboard and get a good laugh. Or you can have Circuit CIty put it on the address label for the stuff you order from their site.
J00bie from The Star Syndicate made this word funny and proper to use. Infact, J00bie makes my pen0r happy!