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1.
Some one who seek out and craves thrilling adventures and/or activities to get an adrenaline rush.
Carey Hart flipped his bike backward because he is such the adrenaline junkie.
by Ken Brenan August 26, 2005
 
2.
Someone who gets high on adrenaline and possibly addicted to it. They usually supplement this addiction by doing activities that give them adrenaline rushes such as shoplifting, gambling, skydiving, stock market trading and possibly fighting.
Guy skydiving: "Oh my god this f****** awsome."

Observer: "Wow look at that adrenaline junkie, he just can't get enough of it can he."
by creekutsu November 21, 2007
 
3.
Someone who lives off or gets high off Life and/or adrenaline. One can get this from sports, music, dreams ect.
I am an Adrenaline Junkie for Life.
by Kaylee Buttons October 10, 2007
 
4.
Someone who frequently gets high on Life, loves and follows his or her dreams, follows his or her heart, and lives Life to the max.
Kales is an adrenaline junkie for life.
by Kaylee Buttons October 08, 2007