noun

• (UK, Ireland) An effigy of a man burned on a bonfire on the anniversary of the Gunpowder Plot (5th November).
• (dated) A person of eccentric appearance or dress; a "fright".
  "“But shan’t I look a guy?” “Not a bit of it. Jist the very kick!”"
• (colloquial) A man or boy; a fellow.
  "“You don't say so? I thought he was some guy from Pennsylvania.”"
• (especially in the plural, often controversial) A person (see usage notes).
  "My “Guys” actually constitute a collection of people that range from my nearest and dearest girlfriends, my immediate and extended family, co-workers and acquaintances that care."

verb

• (intransitive) To exhibit an effigy of Guy Fawkes around the 5th November.
• (transitive) To make fun of, to ridicule with wit or innuendo.
  "The dusky hunters "guyed" the palefaces who could not do as well as they with their primitive weapons, even though the fire spouted from the iron tubes and the balls that could not be seen by the eye carried death farther than did the missiles launched by the natives."
• (theater, transitive) To play in a comedic manner.
  "To guy the speech in the manner of an old-fashioned 'ham' for cheap laughs...."

noun

• (obsolete, rare) A guide; a leader or conductor.
• (chiefly nautical) A support rope or cable used to aid in hoisting or lowering.
• (chiefly nautical) A support to secure or steady structures prone to shift their position or be carried away (e.g. the mast of a ship or a suspension bridge).

noun

• (British) An effigy of Guy Fawkes burned on Bonfire Night