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A great way to not sound like a child when showing displeasure with a situation, person, action, outcome or any other thing that might go wrong in your sad little life.
This will, however, not simulate being an adult who has the balls to use big kid words. This might make you appear (based on delivery, situation and volume) 12 to 16 years of age unless you -are- said age, in which case present company's level of sobriety will determine how much of a tool you look like. The higher your company the greater the return.
Used mostly in Multiplayer Video Games to work around chat filters and to evade the Terms of Use which often frown upon language that might be considered harsh by people who think you should have their ideals.
1) Dood: "Then she stopped and I was all 'What the eff, broham?'"

Guy: "That was almost cool, but you eff'd it."

2) High Teen: "Doooood... Subbed my toe. Effin' hell, hurt like eff."

Wayhigh Teen: "I'm laughin' so hard it effin' hurts! You rock!"

Notsohigh Teen: "Eff? Really?... *yawn* What a toolbox."

3) WoWkid: "Eff, that boss one-shot me. EFF!"

WoWkid 2: "No cussing, I'm offended by people who have their own personality."

WoWkid: "Pfffff, it's not against the ToU. Nobody can stop me!"
Eff by Machination July 21, 2011
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Don't eff with me, dude.
Eff by Leksi January 29, 2003
Related Words
eff Effie effin effy Effort effeminate effing Effexor effectuating Effit
An abbreviation of the word 'FRIENDS' or 'FRIENDS FOREVER' from 'Best Friends Forever' or 'Bff.' Typically used between two Bff's who have created nicknames for each other from 'BFF,' one friend is Bee and the other is Eff Eff (or just Eff for short.)

Spellings of this word Eff can range from, 'Eff to Effffffff' depending on how many f's you prefer. Further nicknames include, Effaroo, Effness, Effy, Eff Eff Effness and EffLochness.
Mary: Hey bee

Jen: Hey Eff

Mary: Bee i'm in such a hmmf :(

Jen: Don't worry we'll be bee's and eff's forever.
Eff by HmmfCreator May 27, 2009
Like Jeff, except not as good.

Also used as a replacement of fuck.
I got peed on. Eff.

Effing A I'm tired.

I just got effed in the a.
Eff by Boki, Jeff, Bryant June 11, 2006
eff by Katieqk December 26, 2005
Noun. Stands for Eternal Friends Forever. An EFF is a living thing that exists between two people. When an EFF is achieved, it must be nurtured and weened until it is healthy and mature. It brings joy to those that it belongs to and, depending on the longevity of the EFF, it will grant it's master's eternal life.....that is, until it is broken.
EFF can be used to describe the actual relationship or entity...

"Omg, the EFF totally sucks today!"

...or it can be used to describe the participants of the EFF...

"Omg like you are totally my EFF k? Pengers and smeagols!"
EFF by Derk July 7, 2004