Much related to the popular words such as Epeen and E-peen. An Epeener is an individual who almost always seems to play online games and MMO-based games exclusively to flex and increase his or her virtual "epeen" portfolio.
Guild Recruiter: " Hey man, why do you want to join our guild?".
Epeener: " Sounded like my type of people, just to let you know in EverQuest I was the first shaman to 50 and I was also in the first guild on my server to take down vox for the first time. In WoW I am a grand marshal and I was one of the first there".
Guild Recruiter: " You should fit right in, most of us are unemployed also".