Someone addicted to and/or dependent on various stimulants ranging from caffeine to amphetamines.

Signs of a stim junkie include nervousness, anxiety, twitchiness, and jumpiness - even when not on stimulants.
Finals Week is coming up and Paul blew all his money on Rockstars and Adderall. He sure is a stim junkie.
by LostTheGame November 15, 2010
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A former gym bro who got a bit too much enthusiastic about pre-workout supplements and now uses working out only as an excuse to get absolutely cracked out on illegal dark market pre-workout powders.
A: "Look at that insane guy throwing dumbbells around like crazy!"

B: "I know, I've just seen him take 5 scoops of that DMAA-based pre-workout drink. What a stim junkie!"
by Victorinoxx July 14, 2022
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