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English word janky comes from English junk
junk (English)
(transitive) To find something for very little money (meaning derived from the term junk shop). (transitive) To throw away. (dated) A fragment of any solid substance; a thick piece; a chunk.. (nautical) Salt beef.. (slang) Any narcotic drug, especially heroin.. (slang) The clothed genitalia.. A collection of miscellaneous items of little value.. Discarded or waste material; rubbish, trash.. [...]
junkie (English)
(by extension) An enthusiast of something.. (slang, pejorative) A narcotics addict, especially referring to heroin users.
janky (English)
(jargon, computing, rare) Unresponsive (of a software application’s user interface), sluggish.. (slang) of poor quality, odd.