What does EF stand for?

Epic Fail (Internet slang)

This definition appears very rarely and is found in the following Acronym Finder categories:

Slang/chat, popular culture

Other Resources:

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Endgame Framework (modeling and simulation) Enemy Forces Energy Factor Engineering Fundamentals English Finish Enrichment Factor Enterprise Framework Entry Fee Environmental Factor (The Olewine Company) Ephedrine Free (thermogenic formula)		Equifax (credit reporting agency) Equipment Failure (Wandel Goltermann) Equivalent Focal Length Eris Free (Internet Relay Chat network) Escuela de la Fe (Spanish) Europæiske Fællesskab (Danish: European Community) Excitation Frequency Exhaust Fan Expedited Forwarding Experience Factory

Samples in periodicals archive:

Have suffered an epic fail - and promptly facepalmed?

Trend watch... NET-SPEAK TRANSLATED

We spent the day practising our walking and trying not to do a Naomi Campbell (who once stumbled in an epic fail while wearing unfeasibly high Vivienne Westwood platform shoes); changing in and out of our outfits and doing what women do best - talking about everything and anything.

Everyone's a winner in a catwalk celebration

This popular comedy portal features a wide range of hilarious videos and comedic forms, from dry wit, to epic fails, to rich parities and more.

Laugh Out Loud ... From Coast to Coast!