A variant of "fucking" used on Canadian television, primarily "Royal Canadian Air Farce". Pre-teens have been known to use in when quoting and the term "fucking" comes up in the quotation.
"That's effin' ridiculous!"
by Bowman June 16, 2002
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Stands for Erectile Function, anybody who doesn't have ED can have EF, it means you are able to hold an erection without Viagra, Cialis etc.
Guy1:I have ED
Guy2:well that sucks, I have EF
Guy1: Man, I wish I had that.
by RAMS57 March 05, 2009
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it is a nicer way to say f*cking
martin : hey stee, you hair is ginger you effing glamyohorio.

stee: sozboz beef
by Steven Ayres December 12, 2007
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The phrase used by the tools of the southeastern CT scene.
"EFS!, I'm a tool! I'm a tool!"
by DILLfrshtildeath November 11, 2007
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