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1.
EFG
EFG stands for Epic Fail Guy. He is a meme on the website 4chan. He is usually represented as a stick figure wearing a Guy Fawkes mask, and never does anything right. Combo? Fail. Meme? Fail. Comment? Joke? All fail. He can't even shoop a decent whoop.
EFG: LETS!
EFG: GET!
EFG: READY!
EFG: TO!
anonymous: fail.
by Fresnel August 22, 2007
 
2.
EFG
abbreviation for Every Fucking Goddamn <something>. bonus points when used with Hour to get EFGH.

also makes memorizing the alphabet song more fun.
1. On the way to work i hit EFG stop light

2. That yippy dog woke me up EFGH last night!
by SKDu69 March 25, 2010
 
3.
efg
Reverse of GFE; Used on Craigslist to hide from law enforcement that the whore provides "girl friend experience" services including bare back blow jobs to completion and full service.
IMUS: Those knappy headed ho's are EFG providers.
CBS: You dumb ass, you're fired!
by Imus On The Dole April 13, 2007
 
4.
efg
abbriviation for evil fucking grin
philimon: dude i blew up that guys post box!
sipho: LOL!
philimon efg
by doppy November 01, 2004