The Collaborative International Dictionary of English v.0.48:

Pop \Pop\, v. t.
   1. To thrust or push suddenly; to offer suddenly; to bring
      suddenly and unexpectedly to notice; as, to pop one's head
      in at the door.
      [1913 Webster]

            He popped a paper into his hand.      --Milton.
      [1913 Webster]

   2. To cause to pop; to cause to burst open by heat, as grains
      of Indian corn; as, to pop corn or chestnuts.
      [1913 Webster]

   3. To eat or swallow; -- of food, especially snacks, in small
      pieces; as, he popped a whole can of peanuts while
      watching the movie.
      [PJC]

   To pop off,
      (a) to thrust away, or put off promptly; as, to pop one
          off with a denial. --Locke.
      (b) to make a statement, or series of statements,
          forcefully and in an opinionated manner; as, he popped
          off about his dislike of modern art.

   To pop the question, to make an offer of marriage to a
      lady. [Colloq.] --Dickens.
      [1913 Webster]