noun

• (slang, US) A prostitute's client.
  "The girls sat there while the johns (customers) moped around giving them the once-over."
• (slang, US) A device or place to urinate and defecate: now usually a toilet or lavatory, but also (dated) a chamber pot or outhouse.
• (slang) A Western man traveling in East Asia.

name

• A male given name originating from the Bible [in turn from Hebrew]; very popular since the Middle Ages.
  "a John Doe murder case; the dreaded Dear John letter; if we were to ask John Q. Public his opinion"
• A male given name originating from the Bible [in turn from Hebrew]; very popular since the Middle Ages.
• (biblical) Persons of the Christian Bible: John the Baptist; and names possibly referring to one, two or three persons, frequently called "Saint": John the Apostle, John the Evangelist and John of Patmos (also called John the Divine or John the Theologian).
  "There was a man sent from God, whose name was John."
• (biblical) The Gospel of St. John, a book of the New Testament of the Bible. Traditionally the fourth of the four gospels.

noun

• (UK, military, slang) A new recruit at Royal Military Academy Sandhurst.
  "I and the other "Johns," as I soon discovered all new-comers at Sandhurst were, and are still, styled, although at the time I was unconscious of it, managed to troop in after the A company, but although not two minutes after them, found all the different messes already seated and hard at work."
• (US, slang, archaic) Alternative letter-case form of john (“a toilet, lavatory, outhouse, chamber pot”).
• (video games, Super Smash Bros.) An excuse, chiefly made by a losing player for their poor performance.
  "Remember, no Johns."