Slang term for a person addicted to drugs, especially stimulants like methamphetamine. Strongly associated with criminal subculture; not used in formal contexts.
See also: シャブ
That guy is a total junkie.
It's extremely difficult to break free from stimulant addiction.
Compound of シャブ (slang for stimulant drugs, possibly from the sound of snorting or from English 'shabu') and 中 (addict, from 中毒).