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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.
By saying that all those players are nubs, you are just flexing your e-peen.
e-peen by Graft January 5, 2008
Related Words
internet slang for ego, pride, or attitude in the virtual world. long standing net definition for the age old "bigger penis" arguement.
"SW III was nothing but a bunch of Lucas e-p33n."

"I just slaughtered 28 people in that game of Battlefield 2 and never died. Man my e-p33n feels huge."
e-peen by Morfus September 14, 2005
v. used to describe the act of showing off or stroking one's own ego, esp. with regard to computer game prowess.
1337s4v10r: U l00zrz just bitch coz u dont no how 2 play ur toons rite!!!11 lern 2 play, fuktards!!one11
casual_gamer: There's always some asshole e-peening on this forum <ignore button>.
e-peen by Jaded, but Dreaming February 18, 2009

Silent E-Peening 

The act of gloating, or rubbing a victory in someones face, without actually doing or saying anything. Can also be silent epeening when the person ahead in the competition will not acknowledge the other participant
Two people are playing a fighting game, one just won the game land-slide. He's doing nothing but sitting there not acknowledging the other person talking to him. "Stop your fucking Silent E-peening you faggot"
Silent E-Peening by Beecels May 28, 2010
He posted his Mobile Legend score on Facebook to stroke his e-peen.
e-peen by chucky4896 May 31, 2018
(noun) A reference to male genitalia in the world of computer forums.
Bob- "Dood! I totally Pwn Joo!"
Dave "No man I totally Pwnd Joo!!!"
Sally "Would you guys stop flexing your E-peens?!"
E-Peen by Alphajonny September 26, 2005