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hophead

American  
[hop-hed] / ˈhɒpˌhɛd /

noun

Older Slang: Disparaging and Offensive.
  1. a person addicted to narcotics, especially opium.


hophead British  
/ ˈhɒpˌhɛd /

noun

  1. slang a heroin or opium addict

"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

Etymology

Origin of hophead

First recorded in 1910–15; hop 2 (in the sense “a narcotic drug”) + head (in the sense “habitual user of a drug”)