e - meaning online
peen - short for penis

A person's ego, pertaining exclusively to their online personality.

e.g. a big e-peen = a big online ego.

Unlike rl-peens (i.e. a real life penis), e-peens are 'flexed', brandished, whipped around, (or otherwise used) with unfailing regularity.

Another difference between e-peens and rl-peens are that e-peens can shrink and grow exorbitantly, i.e. more than a regular penis would with an erection.

Music so good it could elicit sexual arousal.

internet slang for ego, pride, or attitude in the virtual world. long standing net definition for the age old "bigger penis" arguement.

short for electronic penis, this is used for losers on the internet to try and boost their self esteem by using a facticious item such as the epeen, usually refered to in size.

v. used to describe the act of showing off or stroking one's own ego, esp. with regard to computer game prowess.

(noun) short for "Electronic PEnis ENlargement".
Behavior quite commonly found on online discussion boards or similar, where some looser tries to establish his superiority - and thus the merit of his or her opinion - by stating how skilled and awesome he or she is, rather than forming a sound argument.
Generally also used to condescendingly refer to someones ego.

Equipment Potency EquivalencE Number.

Or just EPEEN. A joke made by Blizzard on April Fools 2010. Later made into an actual add-on you can use in-game. It measures your gear and displays your EPEEN bar above your characters head as well as measuring the surrounding character's EPEEN. The higher your EPEEN score is; the bigger the EPEEN bar is.