foamer

/F OW1 M ER0/
noun
  1. 1

    A device that foams or froths liquid.

  2. 2

    (cooking) A screw-top culinary device that comprises a pressure vessel used to hold a liquid and is charged with a compressed gas, to force the contents out of the nozzle, to create a foam.

  3. 3

    (US, slang, sometimes derogatory) An obsessive railfan