Source : Webster's Revised Unabridged Dictionary (1913)

Wango \Wang"o\, n.
   A boomerang.

Source : Free On-Line Dictionary of Computing

wango
     
        /wang'goh/ Random bit-level {grovel}ling going on in a system
        during some unspecified operation.  Often used in combination
        with {mumble}.  For example: "You start with the ".o" file,
        run it through this postprocessor that does mumble-wango - and
        it comes out a snazzy object-oriented executable."
     
        [{Jargon File}]