juice bar n. a methadone clinic, especially one that is seen to encourage addiction rather than cure it. (source: Double-Tongued Dictionary)
Further reading
In 1916, a small-town newspaper in Pennsylvania printed a fanciful item about a local gathering with a guest list that included, among others, Miss Ella Vader, Mr. Ray Zor, and other punny names. This is part of a complete episode. Transcript of...
A North Carolina listener is curious about his meemaw’s use of a term meaning “food” that he heard as either jasmine or jassum. A dialectal term with various spellings that include jassum, jasum, and jazm can mean “gravy,” “sauce,” or even “juice...
Not sure where you got this definition of ‘juice bar’, but it seems rather narrow given the fact that juice and smoothie retail stores are called juice bars and have been since the 1950s.
What do you mean “you’re not sure”? Can’t you see the four citations that show how it’s being used?