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EFL - English as a Foreign Language. Taught to students outside an English-speaking culture, overseas, as opposed to ESL, English as a Second Language, taught to foreign or immigrant students within an English-speaking culture. Subject or program of study, a major or credential qualifying one to teach the subject.
He has a credential in EFL, so he should know what he's doing teaching English to Japanese students.
EFL by Rick Hayhoe June 19, 2006
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I failed my biology final and ended up with a D in the class, EFL
EFL by tipsyfo0sayz June 9, 2009
Related Words
To "efl" is to excreted from laughing.

It has a simmilar type of use to "lmao" or "rofl".

"efl" can be expanded, such as "efl my nefl" which can be used to show you are excreting more than a standard "efl".
Dick: Haha look at that tiny penis!
Harry: efl!
efl by bennelsworth August 5, 2008
English as a First Language
as opposed to ESL, English as a Second Language

When someone who's native tongue is English has such a poor command of their first language that they are constantly making mistakes that someone who is ESL might make
Fred: I've seen like 5 movies in the last week
Lynn: wow you must have a lot of time in your head
Fred: what?
Lynn: i mean time in your hands
Fred: you mean time ON your hands?
Lynn: oh yeah thats what i meant
Fred: damn you are EFL
EFL by EdibleFarmedLemurs October 17, 2009
Expressive acronym for "Exploding/exploded from laughter" derived from the French acronym PTDR
English as First Language
When someone whose first language is English speaks their own language more poorly than many others who learned it as a second language. Often they will make grammatical mistakes that would be uncommon among ESL (English as Second Language) folks.
Fred: "Why do we have to go to school. I didn't learn nothing useful in there. I skipped HS I could of went but I could care less what they think I need to learn, I'm doing good without wasting my time."
George: "Man, you have a serious case of EFL!"
EFL by The Reaver of Darkness November 13, 2020

EFL Teacher 

One who teaches English as a Foreign Language. Usually a native speaker of the language teaching outside his/her country of origin. A career which attracts the adventurous, the eccentric and the sociopathic.
Barman 1: Who's that cool motherfucker ?
Barman 2: Don't know, but last night he came in smoking a joint, asked me where the nearest brothel is, drank a whole bottle of whisky, did some coke off Mia's tits, fucked her, buggered her and left. I think he's an EFL teacher.
Barman 1: Shit, that's so cool. I wish I was him. Oh, look- he's just knocked out two of the bouncers with one punch.
EFL Teacher by Nice Uncle Andy October 9, 2006