Measurement of how quickly one responds to electronic communication.
"John took a week to reply to my email. I guess he's got slow e-flexes."
by James Lloyd C. June 17, 2008
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The art of convincing people over the internet how cool you are. E-flexing is mostly done by E-tards and hobo's with broadband.
Dude, I'm gonna e-flex you so bad, I would so kick your ass! And I'm certain about it even though I've never saw you, also its good that I will never see you, as it would most probably mean I'd get my fat nerdy ass kicked.
by Tudor Hansson April 3, 2006
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Internet thug "bootcamp" for assholes. Those who have the biggest e-peen are better than those who don't. People compare e-peen sizes via some odd sort of "flexing" that occurs in which people try to show the other how much better they are by using all capital letters.
Mary Poppins: I CAN FLY MOTHER-FUCKER.

Joe: DAMN YOUR E-PEEN IS HUGE.

In this case, Mary Poppins is showing how he is a master at e-peen flexing.
by SUCKMYCANADA June 20, 2008
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