Wait, that's "DO DO DO DO DO" not "GO GO GO GO GO". What does "DO DO DO DO DO" mean?
Its the musical theme from Policenauts. Hideo Kojima would reference it again in Metal Gear Solid, which is where most people remember hearing it from. You can hear it in the first 10 seconds of this clip: https://www.youtube.com/watch?v=-mx4RE3jrTs