Top definition
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 14, 2010
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