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1.
In modern internet vernacular, a generic all-purpose phrase that roughly equates to "duh," and can be used in a variety of situations to indicate stupidity.
Person #1: That horrible website somethingawful.com stole my intellectual property by taking pictures that I had on MY WEBSITE and manipulating them in offensive ways with Photoshop! I shall send them a legal threat posthaste!

Person #2: (summarizing Person #1's statement for others) HURF-DURF INTERNET LAWSUIT
by Jett November 14, 2006
 
2.
When hurf durf is seen, it is understood that whatever has been quoted and labeled as hurf durf is completely and utterly unreasonable and impossible of being taken seriously.

Generally used when quoting someone, especially (but certainly not limited to) in the context of an internet game forum. Hurf durf occurs when someone goes on a long-winded tangent about something that is universally insignificant but is present in the original poster's mind and is EXTREMELY important to that person. A declaration of hurf durf is generally directly followed by an ad hominem or general attack on the idea which was proposed.

Most often occurrences of hurf durf are unreasonable demands to alter a law or game mechanic so it will serve the needs of a very specific group, leaving all others effected at a disadvantage.

In real life, Calls for laws to consider obesity a physical handicap would be considered hurf durf because obesity is a self-inflicted condition and penalizing the rest of the population with higher taxes because fatty can't put down the donuts would be generally unreasonable.

In a gaming context, requests for a buff or nerf that would make one specific item or class unreasonably superior would be considered hurf durf, as it would destroy balance in the said game.

A: I think hoverrounds should be made available for everyone diagnosed with chronic obesity through a government grant. Chronic Obesity is a disease! It's been proven by SCIENCE!!

B: HURF DURF I'M TOO LAZY TO WALK SO BUY ME A SCOOTER

A: Warlock damage over time attacks should be considerably augmented to compensate for the lack of armour they possess. In the book Hamburt and the 350, a warlock defetated seventy -two Angerbeasts with one damage over time spell. I have attached a spreadsheet to help illustrate my point.

B: HURF DURF PRESSING TWO BUTTONS WAS TOO HARD FOR YOU TO MANAGE, NOW YOU ONLY WANT TO PRESS ONE. EAT MORE DONUTS ON YOUR SCOOTER FATTY
by Manawski2 June 13, 2008
 
3.
Exclamation. "DURRRR YOU'RE AN IDIOT."

Origin: Metafilter, 2005. "Hurf Durf Butter Eater" was the self description of the notorious Metafilter user U.N. Owen when she was complaining about how people called her fat when it wasn't her fault she was allergic to exercise. Used as an noun earlier (see other entries).
Arnold: I'm not leaving this place until I get my refund!
Betty: HURF-DURF.
by Shii August 22, 2007
 
4.
Hurf and durf are words that are used on the internet to replace just about any other word, though most commonly nouns. Can be used as "hurf," "durf," or "hurfdurf," though the latter is most common in key or multi-syllabic words.
They see me hurfin', they durfin', hurf durfin' and trying to catch me hurfin' durfin'.
Tom: What's up hurf? How did your hurf durf turn out?
Jim: Not very hurf, durf. It hurfed and they had to cancel the hurf durf.
by Camoron March 03, 2007
 
5.
Noun;

A person that is not to be taken seriously.
Jerkden: Play my card game!
Kiko: Well, I don't know how...it's complicated, and I don't feel like learning that shite.
Jerkden: It's okay, be like Dackson. He's no good at the game, but he plays anyway and has fun.
Kiko: Well, Dackson will be the lone hurf-durf; I'm not playing!
Jerkden: Suit yourself.
*Kiko punches Jerkden*
by Kiko April 29, 2004
 
6.
Hurf (v) From Old English: To quietly expectorate
Durf (n) From Old Norse: The mixture of alcoholic beverages in the stomach after a night in a lowly tavern
Hurf durf: a sound often heard eminating from public toilet cubicles at 3:30am on a Saturday morning
(Dad) How was your evening, son?
(Son) Well I hurf-durfed at the Slug'n'Lettuce, and after that Marie wouldn't shag me.
by OzJimbob October 03, 2006