adj

• (dated) Smooth or slippery.
  "a sheet of glib ice"

verb

• (transitive) To make smooth or slippery.
  "1628, Joseph Hal, “Christian Liberty Laid Forth,” in The Works of the Right Reverend Father in God, Joseph Hall, D.D., Volume V, London: Williams & Smith, 1808, p. 366, https://books.google.ca/books?id=8iUBAAAAQAAJ&printsec=frontcover#v=onepage&q&f=false There is a drunken liberty of the Tongue; which, being once glibbed with intoxicating liquor, runs wild through heaven and earth; and spares neither him that is God above, nor those which are called gods on earth."

noun

• (UK, slang, obsolete) A person's mouth or tongue.
  ""Well, Sal, you mum your dubber pretty generally, but when you do slacken your glib you may as well do it civilly.""

noun

• (historical) A mass of matted hair worn down over the eyes, formerly common in Ireland.
  "Whom when she saw in wretched weedes disguiz'd, / With heary glib deform'd and meiger face, / Like ghost late risen from his grave agryz'd, / She knew him not […]"