Part of the Book "1984", It shows how Big Brother has brainwashed the people so much that they belive 2+2=5.
"... 2+2=4 dude"
"pft not in 1984 it isnt"
by Fuji March 25, 2005
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A joke that nerds usually make about the rounding of numbers. If you do 2.3 rounded (2) + 2.4 rounded (2), you get 4.7 which rounds to 5.

And because humans are imperfect, we are never able to make exact precision on anything. This means, that anything we do, we are doing some kind of rounding/estimation at some point. So, this means that 2 + 2 = 5 but only for very large values of 2.
2.36 rounded = 2
2.44 rounded = 2
4.8 rounded = 5

2.36 + 2.44 = 4.8

2 + 2 = 5 (when all numbers are rounded)
by Eddie Pyune September 25, 2005
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a track from radioheads "hail to the thief" amazon.com have reviewed the album they said:

"Hail to the Thief borrows equally from each. Its title implies that this will be a collection filled with songs of anger and dissent, but Radiohead no longer howl at the moon like they did on 1995's The Bends. Instead, they use eloquent metaphors and complicated arrangements to express the uncertainty, fear and anger arising from the 2000 U.S. presidential election and a post-9/11 world. There’s no doubt about where Thom Yorke and company stand; the prog-rock break on "2 + 2 = 5" and Yorke's terror at the thought of being "put in a dock" make that immediately clear"

it can be used to express strange things that have happend , and or lack any sence
"did you see how that guy got an extra can of drink from that machine?"

"yes it was very 2+2=5"
by wikiki March 25, 2005
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Interesting fact: 2.4 (which rounds to 2) plus 2.3 (which rounds to 2) is equal to 4.7 (which rounds to 5).
You could then end up with 2 + 2 = 5 if you don't keep the same number of significant figures in your calculations.
by n3rd March 26, 2005
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Maths nerds making a joke out of some line from George Orwell's 1984
"Well *actually* 2 + 2 could = 5 !"

*pathetic nerd eagerly waits for confused stares to reinstate his superiority
by What March 25, 2005
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1.) Mathematical formula resulting in the product 21931.

2.) An extremely roundabout way of saying 1337, 31337, leet, or elite.
1.) 3133(2+5)=3133(7)=21931. Zigei?

2.) ELEE(Z+S)=ELEE(T)=ELEET!
by Manawski March 5, 2003
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1. The signal that a guy gives to his friends hiding in his closet (40 friends; no more and no less)to complete the final stage of the Harlem Beatdown. The signal is to be given by using ones fingers to represent each number (shown off in sequence).

2. 125th street runs through Harlem.

3. The first letter in the alphabet is A, the second is B, and the fifth is E. That spells Abe, as in Abe Lincoln
1. To make things interesting, I stuck my dick in the fat bitches ass while giving the 1-2-5 to my buddies. Not only did she not enjoy the dick in the ass without lube, but the oncoming Harlem Beatdown that I ordered was going to send her up the bend.

2. 125th street is the inspiration for the codename 1-2-5.

3. Abe Lincoln wrote the Gettysburg Address. I know what you perv fucksticks are thinking however...
by n00b nuggets January 7, 2008
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