A substance used to stay up for insane and inhuman ammount of hours upon end. Commonly used by Korean Rice Farmers in World of Warcraft or the people you see in Newly Release MMORPG's who have reached maximum level in less than a week.
That rice farmer has been up for 4 days straight now exp grinding.
by KevinArturo May 31, 2005
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First developed and marketed in the 1930's as Benzedrine to fight narcolepsy, Amphetamines are now used to fight everything from Minimal Brain Dysfunction (MBD) to Attention Deficit Hyperactivity Disorder (ADHD).

During World War II amphetamines were widely used to keeping soliders alert during battle, or on long patrols. It is now being used widely by anybody who want's to stay up late into the night, for example truck drivers, or students staying up studying.

In the past fifty years though amphetamine, or speed/tweek as it is known, has been used by drug addicts simply looking for another high. This could range from your average drug user to ravers who take speed with ecstacy to inhance the rush.

Some symptoms of amphetamine use are: restlessness, tremors, rapid breathing, hallucinations, panic, aggressive attitude, nausea, vomiting, diarrhea, heartbeat fluttering, seizures, and pupil dilation.
After smoking all that speed, there is no way I'm going to be able to sit still.
by Aegrimonia July 13, 2004
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a drug that is used to treat ADD in hyperactive children. Adults use the drug as a stimulant and is often abused. It is used like caffeine to keep a person awake, for energy, but often used in parties; in cases party and play. Workers, drivers, bikers, skaters, athletes, students often use this drug.
Common names, amphetamines, speed, whizz, shit, dope, tweak, etc etc
amphetamines taken by most ppl is used to stay awake like caffeine but hits the central nervous system and acts as dopamine.
by jackson, j May 26, 2006
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A potent central nervous system stimulant that is very dangerous
These amphetamines make me want to do strange and sometimes disturbing things but it doesnt matter as it's a temporary reliever of depression and makes school bearable
by MyFleshIsAGhost March 16, 2019
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A racemic sympathomimetic amine C9H13N or one of its derivatives (as dextroamphetamine or methamphetamine) frequently abused as a stimulant of the central nervous system but used clinically especially in the form of its sulfate or hydrochloride salt to treat hyperactive children and the symptoms of narcolepsy and as a short term appetite suppressant in dieting.
I snorted some amphetamine last night.
by Anusface March 30, 2005
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Anger and phychosis brought on by amphetamine use. Someone with amphetaminitis will normally demonstrate an aggressive attitude towards others or in mild cases just be snappy and difficult to deal with and generally a pain in the ass.
Bloody Gwens been bombing that shit again, if we cant find some weed quick shes gonna have a bad case of amphetaminitis
by Coinage October 26, 2006
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The act of searching the floor for crumbs of meth
What's bill doing?
Ah he's fucking amphetamining hoping to score free shit
by Shit cunt 86 March 14, 2019
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