Top Definition
Erf
erf is the planet we live on.
there are alot of people on erf.
by nick April 28, 2006

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Erf
A word that signifies frusteration.
Erf, I've fallen down and I can't get up!
by Mer October 17, 2003

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erf
The error function. Computer programs such as Mathematica and Maple incorrectly evaluate about 95% of integrals taken over all space. When the program fails to recognize an integral, it automatically spits out "erf" for an unknown reason.
Person 1: Dude, we have a Quantum Mechanics homework set due in 30 minutes, & I can't figure out how to evaluate this integral.
Person 2: Don't worry, we'll put it into Maple!
Maple: Erf erf erf erf erf...
Professor: epic fail.
by MorvAreed April 14, 2009

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erf
Phrase uttered when in a overwhelming state of confusion, mostly by dogs.
Erf? Uh, I should've studied for this test.
by droneaccount808 November 17, 2010

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ERF
Word used to express disappointed yet accepted state of undesired feeling, situation or physical state. A vocal statement of realization - that things are f-ed up and you can't change it. "That's erf'ed up."
You just woke up from a gigantic night of partying... realize head is pounding and stomach about to hurl. Instead of groaning, which could mean anything, you mutter "ERF!!" and those laying around the room also waking with hangovers acknowledge your state and also chime in with an affirmative, "ERF!".
by BleenieTheCat October 14, 2005

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erf
gansta way to say earth
we's da seeds of da erf
by chelsea September 01, 2003

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Erf
noun. (erf)
1. A nonchalant noise often made by wired kids; 2. A building block in the formation of Queasy Erf Moneybags Bay Bay 4th gen. Bay; 3. E.R.F. - Every Redneck Farts; 4. Absolutely nothing
1. erf, erf...
by Queasy April 27, 2012

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