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speed freak

or speed·freak

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noun Slang.
  1. an addict or habitual user of amphetamines, methamphetamines, or similar stimulating drugs.
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Origin of speed freak

First recorded in 1965–70
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for speedfreak

speedfreak

noun
  1. slang an amphetamine addict
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012