FEF is a word/number/letter that is used when you don’t know what word or number you’re trying to come up with. It’s used in the Smosh Live: Hangman sketch.

It’s also a letter in the Redneck alphabet.
Guy: So how do you spell atrocious again?
Guy 2: Uh A-T-R-...fef?
Guy: What?
by MariatheWaylien August 9, 2018
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1. Aw man! I got fef in my hair.

2. I made her fef twice last night!

3. That ride was so Awesome I think I feffed!
by TheHunt September 1, 2008
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fefs is a faroese word for the word: Fupa which stands for Fat Upper Pussy Area, if we translated it to Faroese it would be: Feitt Erva Fisu Stað. And that's why we say Fefs.
Tú hevur eitt lekkurt Fefs, góða.
( in Eng) that's a hot Fupa you have there, sweetie.
by abigfupalover April 21, 2011
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Someone (or generally something) that doesn't make sense in the situation whatsoever.
"That's a bunch of fef."
by alisosi February 4, 2023
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Fat End First - inserting the fat end of something into a bodily cavity. This is usually with the intent to cause pain. Anything with a fat end and a slender end can be used in this manner: carrots, baseball bats, and water bottles to name a few. Depending on the bodily cavity selected, this may result in difficulty in extracting the object. This acronym is generally used as a verb to describe the action of the penetration.
Joe just fef'd me with a carrot.

Go fef yourself with a baseball bat.

I just fef'd Caleb with a bowling pin.
by RedWater June 30, 2009
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