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Drug world expression for a drug user who gets a thrill from just feeling a needle go into the body - even if no drugs are involved.

Comes from the Pavlovian stimulus/rsponse theory that after repeated use, the feel of the needle, followed by the rush of the drug will soon no longer require the drug to get the rush.
Man, that guy's a real needle freak - he can get off shooting water!
by PJ Poppyjoe March 15, 2005