WordNet (r) 3.0 (2006):

pidgin
    n 1: an artificial language used for trade between speakers of
         different languages

The Free On-line Dictionary of Computing (30 December 2018):

Pidgin

    A text chat application that
   work with many different chat systems at the same time.
   Systems it works with include AOL Instant Messenger, Yahoo!
   Messenger, Windows Live Messenger, IRC and Facebook.
   There are plug-ins to add even more systems, e.g. Skype
   and to add features.

   Pidgin was first released in 1998.  The name "Pidgin" was
   applied in 2007.  It is available for several operating
   systems.  It is licensed under the GNU General Public
   License.

   The name "Pidgin" comes from the term for a simplified human
   language that evolves from two or more languages.

   Pidgin Home (http://pidgin.im/).

   (2012-04-15)