pothead

pot (“marijuana”) +‎ -head. First sense appears c. 1957 in the writings of Jack Gelber. Third sense appears c. 1639. (This etymology is missing or incomplete. Please add to it, or discuss it at the Etymology scriptorium. Particularly: “what is the date/origin of the second sense?”)

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pothead (plural potheads)

1. (slang, derogatory) A person who smokes cannabis frequently, or to excess.

   That pothead Shane has a nasty bong.

2. (chiefly Canada) An electric motor's terminal connection or wiring box.

   Synonyms: pecker, T-box, peckerhead

3. (slang, derogatory, obsolete) A stupid individual; a fool. (The addition of quotations indicative of this usage is being sought:)

• (person): stoner, weedhead