The e-penis, (also known as e penis, ePenis, or internet penis), is a term used widely within the internet community as a measurement of one's popularity, skill, or power within the internet realm. There are many various ways of achieving a large e-penis: High internet speed, hacking abilities, gaming skill, Google hits of your commonly used name or E-mail, and wide spreed notoriety or popularity within popular forum sites such as 4-chan. Its most common usage, however, is to relate to amount of posts or rep bars one has on a forum.

Notes: Contrary to popular belief, so called "rep whores", who rep people all the time and demand rep for no real reason, have been actually proven to have a considerably small e-penis. Also, people who troll in order to build up a red rep bar, are sadly known to have an even smaller e-penis then their "rep whore" counterparts. The motivations behind their willingness to mutilate their e-penis is not yet known, and further study is required to determine the meaning behind these seemingly pointless actions.