In this sense, a reefer is a cigarette made with marijuana (cannabis).

In this sense在這個意思下, a reefer is a cigarette made with marijuana (cannabis)reefer指的是用大麻捲的菸。

It is informal, and a bit old-fashioned: older films and older speakers use it; younger people are more likely to say joint, or other slang. It is not a polite classroom word — it names a drug that is illegal in many places, including Taiwan — so treat it as vocabulary you may read, not as a joke to throw around.

It is informal, and a bit old-fashioned這個字很口語，而且有點過時: older films and older speakers use it老電影和年紀較大的人比較會用, younger people are more likely to say joint, or other slang年輕人比較常說joint或其他俚語。 It is not a polite classroom word這不是課堂上禮貌的用字 — it names a drug that is illegal in many places, including Taiwan它指的是一種在很多地方（包括台灣）都違法的毒品 — so treat it as vocabulary you may read, not as a joke to throw around所以把它當成閱讀時可能會遇到的詞彙就好，不要拿來開玩笑。

The same spelling has other lives, though actually: a reefer can also be a refrigerated truck or shipping container (a clipping of refrigerator), and a reefer jacket is a short navy-style coat. Those are different meanings of the same-looking word; this entry is the drug one.

The same spelling has other lives, though actually不過其實，同樣的拼法還有別的意思: a reefer can also be a refrigerated truck or shipping containerreefer也可以指冷藏卡車或冷藏貨櫃 (a clipping of refrigerator)（是refrigerator的縮寫）, and而 a reefer jacket is a short navy-style coatreefer jacket則是一種海軍風的短外套。 Those are different meanings of the same-looking word這些是同一個字形不同的意思; this entry is the drug one而這個詞條講的是毒品那個意思。