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One who constantly seeks out the sudden increase of energy associated with dangerous activities, similar to the way drug addicts seek out the "high" achieved by drug use. I do about 10 skydives a year because I love the rush so much. People consider me a bit of an adrenaline junkie.
1. slang A drug addict, especially of heroin. I dabbled with drugs near the end of high school, but I turned into a full-blown junkie after I graduated. That part of town is filled with junkies, so I wouldn't go there if you don't have to.
2. slang Anyone with an obsession over or excessive preoccupation with something, akin to an addiction. I've become something of a retro video game junkie over the last few years. I've put an admittedly absurd amount of time and money into my collection. I do about 10 skydives a year because I love the rush so much. People consider me a bit of an adrenaline junkie.
junkieand junky (ˈdʒəŋki)
1. n. a drug dealer. (Drugs.) Junkies should be put into the jug.
2. n. a drug user; an addict. (Drugs.) Junkies have to steal to support their habits.