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Basically, crack is silly, intentionally non-serious, and has a high tendency to be extremely crazy and unfounded, such as purposeful OOC-ness or playing on cliches, inside jokes, and/or fanon.

The term crack probably stems from crack as in crack cocaine, as opposed to a crack in a wall. As in, so horrendously unfounded/silly that only one could have come up with it while under the influence of crack.
Ed/Roze and Kagome/Kohaku are my secret crack pairings in the Fullmetal Alchemist and Inuyasha fandom.

Kagome/Sake, Inuyasha/Tessaiga, Inuyasha/Kagome's Seiraa Fuku, Shinidamachuu/Kikyou, Naraku/Kikyou's Ashes, and Jakotsu/Hairpin are also crack pairings - these are all from Inuyasha as well.
by Numisma August 13, 2005
Something that is great, awesome, good.
That new Nas song is crack.
by Antoekneeo May 18, 2005
Circa 1980

A single portion of Freebase Coccaine.

So named for the cracking of the initial rock, into smaller "distributable" pieces.

False origings: Crack was NOT named after a crackling sound. It does not crackle at all... it sizzles as the solid form is reduced to oil which begins to vaporize into the infamous "white cloud".

The term was originally coined on 125th Stree & St. Nickolas Ave in Harlem NY. By Craig.

The song "White Lines" by Grand master Flash & the Furious 5 was dedicated to Craig & the other 3 Base-Heads who were killed in the St. Nick Massacre.
by WhenBlackWasBeautiful September 23, 2003
1. The solid form of the illicit, recreational drug, cocaine.
2. A small gap on the surface of an object.
3. An illegally obtained password or file to a copyrighted computer program.

1. The quality or state of excellence. (often used to describe music)
2. Having a small gap on the surface of an object. -ed

1. To make a small gap on the surface of an object.
2. To illegally pass through some form of passive security (often used with computer programs, see NOUN-3).
3. To punch someone in an altercation.
4. To start. -ing
5. To be occurring. (often used in the greeting, "What's crackin'?!")
1. Yo son i need to smoke some crack ASAP.
2. Theres a crack on the sidewalk over here.
3. I need a crack for that new computer game.

1. That new Young Jeezy song is straight crack.
2. This glass is cracked.

1. You have to crack the egg before you can put it in the mixing bowl.
2. The bank robbers cracked the code to the bank's safe.
3. If he says one more thing about my mother ima crack him in his jaw.
4. Let's get this show crackin'.
5. Ayo, my man, whats crackin?!
by Matthew1218 March 28, 2008
'Freebased' cocaine.

What is popularly known as 'cocaine' is actually the chemical compound 'Cociane Hydrochloride'. This substance is nuetral, the 'Cocaine' part being a base and the 'Hydrochloride (Hydrochloric Acid)' being an acid. It is impossible to smoke Cocaine Hydrochloride because upon being heated, it simply decomposes.

So, some brilliant dopehead realized that the way to make it possible to smoke Cocaine is to 'free the base'. To do this, you mix 1 part cocaine and 1 part baking soda (carbonate of soda) with water. The hydrochloric acid detaches from the cocaine in order to react with the baking soda, producing water vapor and salt. Wait for the water to evaporate, and you have a 'rock' or crack, usually white, yellow, or pea-colored. You will wind up with slightly more crack than you had cocaine.

Street-crack is usually adultered and contains many chemicals in it besides freebased cocaine. To at least partially remove these chemicals, set your rock on a hard surface, heat with a lighter until melted, and then scrape off your slightly more pure crack with a razor blade when it dries.

Crack is much more addictive than cocaine, because it absorbed faster. The lungs have a much larger surface area than the mucas membrane of your nose, so immediately after taking a hit of crack, you'll get the high. It's gone almost as fast, leaving all the dopamine in your nerve synopses screaming "MORE CRACK!" You will then smoke more crack. Unless you are a millionaire, you will probably run out of crack before you die of chronically high blood-plasma levels, so you will most likely start off by selling all your clothes and your house, before resorting to crime and prostitution in order to get a fix.

Have fun, kids.
In a famous study, a chimpanzee hit a lever to get a hit of crack. After the second hit, he had to hit the lever twice for a single hit. After that, four times, and after that, eight times. The chimpanzee eventually hit the lever over 30,000 times for a single hit of crack. Then he died.
by Middle Children Of History April 29, 2007
1. freebase form of cocaine, generally smoked in a crackpipe

2. the crevice between one's butt cheeks.
"The Customs officer stripsearched Oprah and found forty pounds of crack."
by Joe Bone March 14, 2005
The word originates from the Anglo-Saxon term, "crack" meaning fun.

It possibly dates back as far as Old English or the older Scots dialect and is still used today by Ulster-Scots in Northern Ireland.

Borrowed by the Gaelic Irish and spelt "craic", the term has been picked up by UK journalists in recent years and has re-entered the use of the word (Hiberno-English) in mainland UK.

Dublin journalists in the 1970s frequently spelt the word as "crack" in written articles.
What's the crack?
Aye it was good crack!
To crack a joke
by GoonerGary May 11, 2007