Heroin (INN: diacetylmorphine, BAN: diamorphine) is a semi-synthetic opioid synthesized from morphine, a derivative of the opium poppy. The white crystalline form is commonly the hydrochloride salt diacetylmorphine hydrochloride. Upon crossing the blood-brain barrier, which occurs soon after introduction of the drug into the bloodstream, heroin is converted into monoacetylmorphine and morphine, the compounds that mimic the action of endorphins, creating a sense of extreme well-being with the feeling centered in the gut. Heroin affects the bodies Central Nervous System over stimulating the bodies creation of its own naturally occurring pain killers known as endorphins. Long term use can lead to intense physical dependence known as being SICK. Symptoms such as uncontrollable bowel functions, vomiting, sweating, and intense muscle aches, especially in the lower legs are common, and last acutely anywhere from 7 to 10 days. Acute withdrawal is followed by a feeling of lag where even the most common functions like brushing ones teeth is a chore. This lag can last months. A first time user takes longer to acquire a habit (addicted), than someone who has already been addicted. One of the most common methods of heroin use is via intravenous injection, although it may be smoked or snorted depending on purity. Heroin is commonly seen in two different forms, one: as a brown hard toffee like substance known as Black Tar, and two: as a white powder known as China White. The majority of black tar heroin comes from Mexico well the vast supply of the white powder commonly known as china white comes from Indochina.
My back was killing me, and the Hillbilly Herion that my doctor prescribed wasn't doing a thing, so I copped me a bag of that black tar heroin my boy Juan be slinging.
by Harry James Roder December 17, 2007
The illegal used in the British movie "Trainspotting"
Renton, Spud, Sick Boy, and Tommy did heroine at Swanney's apartment.
by N/A July 23, 2003
Extreemly addictive, dangerous, and undeniably fun drug, that if used more than once or twice can cause serious problems. My advice is if you really REALLY want to do heroin, chase the dragon. DO NOT INJECT IT. AN OVERDOSE IS MORE LIKELY AND ADDICTION CAN SET IN AFTER ONE TIME.
Today I took an E-bomb for a concert that I didn't know had heroin in it. It was one of the greatest things I've every felt but even while rolling I regretted doing it. Heroin WILL mess you up if used, even responsibly. Your safest bet is just to stay away.
by Being sober is for the weak. February 21, 2007
A drug that was used by many music stars, including Sid Vicious and Kurt Cobain. The drug was not the reason why they died, but the lifestyle which they lived, such as Sid living without Nancy Spungen and Kurt not able to live the life of a rock star.

(Even though some of us think that Kurt was murdered instead of commited suicide)

Heroin was used by Cobain, but was not the reason for his death.
by MisHapen May 09, 2005
Class A drug used by brilliant many rock stars and the guy from the others
see pete dohertyfor more info
by thelostlibertine April 01, 2005
the hero in me.
just relaxxx
by demitrious February 16, 2004
is straight to do all the time

Yo man lets go get some heroin?

Naw dude, i did that shit the last three days.

Yo its cool, its only heroin.
by loomaytin August 04, 2007
a girl hero!!! take that you weird people who search drugs on urban dictionary...i pitty you.
and then the woman saved the day by rescuing all those people from that burning building. shes definatly a HEROIN
by the right definition dude November 09, 2008
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