Think of someone tied to one thing so tightly that the thing decides the shape of the day: when they get up, where they go, what they think about at lunch. The word names the person by that tie, not by anything else about them. That is why it is heavy when the tie is a drug, and why it becomes a joke when the tie is bicycles or coffee — the picture is the same size, and only the thing on the other end of the rope has changed.
可以想成一個人被一樣東西綁得很緊，緊到那樣東西決定了他一天的形狀：幾點起床、往哪裡去、午餐時間在想什麼。這個字用那條繩子來稱呼一個人，不看他其他的部分。所以綁著的是毒品時，它很重；綁著的是腳踏車或咖啡時，它就變成玩笑。畫面一樣大，只是繩子另一頭的東西換了。
From the word’s history
From junk in the sense of a narcotic drug, plus the ending -ie, which makes a word for a person tied to the thing named.
資料記載這個字是 junk（毒品）加上字尾 -ie。-ie 在英文裡把一樣東西變成「跟它綁在一起的人」。所以這個字從字面上就是「被那樣東西綁住的人」，這也說明了為什麼它一開口就這麼重。
Wiktionary, "junkie"
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