Gauranga originates from sanskrit, and it means "light/gold limbed". The starter of golden sankirtan movement in India was named Caitanya Mahaprabhu, and he was often named Gaura or Gauranga (He is considered a golden lila-avatara of Krishna).
In popular culture, the word has an accepted meaning of "be happy".
A spate of spam emails have also appeared, and are sometimes known simply as the Hare Krishna spam:
Subject: Gouranga
Call out Gouranga be happy!!!
Gouranga Gouranga Gouranga ....
That which brings the highest happiness!!
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