What are manila goo goo's in Steinbech's Of Mice and Men?

I am no expert on the subject or Steinbeck I can only say that as someone who is playing the part of Whit in the play "Of Mice and Men" I have asked the same question and since nobody else has an answer I looked around and believe that I have an idea of what is meant by the phrase Manila Goo-Goos. Based on the context of the term I believe that the short answer is that is a derogatory term of the 1930's used to describe someone who is from the Philippines. During the depression there was a population of Filipinos' working in California and there was an effort to deport these immigrants back to Manila so that the jobs would open up for out of work Americans.