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1.
A clue-by-four is a term used when someone is irritatingly clueless in a detrimental way and not only needs to be corrected, but needs to be chastised at the same time.
Someone needs to hit that stupid hacker script-kiddie with a clue-by-four before he gets us all in trouble.
by Xaprb January 16, 2004
 
2.
A device that is commonly used to give someone a clue. Named as such for its appearance, which is oddly similar to a two-by-four.
That little idiot got my machine infected with a load of spyware, so I whacked him with a clue-by-four.
by (>O_O)> July 16, 2005
 
3.
Used primarily by people in the tech support field, it refers to the desire to hit a stupid user over the head with a board, in the hopes that their brain will actually work properly.
The boss says he broke his 'coffee cup holder' again...would someone fetch me a clue by four?
by Evil Timmy February 18, 2004
 
4.
In most geek communities, being hit by a clue-by-four is generally a sign that the hitter (person doing the hitting) believes the hittee (person being hit) to be an inferior form of life and therefore in need of a good whalloping.

In the past the idea behind the clue-by-four was that you were beating some sense into the hittee. Unfortunately it was later discovered that being hit on the head with a large wooden plank with "CLUE" written on it actually caused a loss of brain cells in the hittee. When you consider that the original intention of the hitter was to provide the hittee with some in the first place, this then put the hittee in a deficit of brain cells. Life, the universe, and everything being what it is, likes to be in a state of balance. So in order to solve the problem of the brain-cell deficit, the hittee would proceed to ask ever increasingly stupid questions causing the original hitter to smack his or her head against a wall, therefore restoring the balance.

For the purpose of beating sense into people, the clue-by-four was replaced by a large foam clue bat which has much the same result as the clue-by-four except does not kill what few brain cells the hittee may or may not already possess. Though the tool of choice now is the foam clue bat, the clue-by-four is still in regular use. It was renamed to the "Luser Attitude Readjustment Tool" which was then shortened to LART.

The key difference between the two tools, though they have the same origins, is what implications of being hit by one might have to your standing in the community that you are a part of.

To be hit with a large foam clue bat signifies that the hitter believes you are being immensely stupid and need correcting in a way that you will never forget, for your own good. Being LARTed is somewhat more common despite it's neurological implications and the fact that it is generally more serious. To be LARTed means that the hitter believes you have done or said something mind-bubblingly stupid and must be punished for your crime. You are not expected to gain anything from the experience as no friendly "constructive criticism" or advice will be given with the LARTing.

It has been theorized is that being hit by a clue-by-four only dislodges the slower, denser brain cells allowing the faster, smarter brian cells more chance of forming rational thought. The tests, however, have been inconcluive; showing positive results in only 42% of subjects.
Don't get hit by a clue by four.
by kodiac1 July 05, 2006
 
5.
(Slang)An uncommon American noun used usually (but not exclusively) by right-wing weblog addicts.

An imaginary ideological (or actual) 'stick' with which we beat someone with whom we disagree.
1. "Listen son, those foreigners need a newkillerclue-by-four from Uncle Sam"

2. "Any assclown tinfoil hat-wearing traitor that doesn't believe in God will get a big clue-by-four when they get bombed to Hell"
by G. Willikins April 28, 2005