This is a (presumably) mildly racist term mean to describe a low-paid member of the working class of a race other than the speaker.
In most cases, the speaker is White, and the worker is either Black or Hispanic.
Wikipedia specifies Asians:
is a term for a low-wage laborer, typically of South Asian or East Asian descent
However, I noticed it in several contexts where the target wouldn’t have been Asian.
Why I Looked It Up
I don’t remember, but I encountered the word multiple times over the course of a year. I believe all references were in “classic” novels or writings (I believe one of them was Cannery Row), that would have been penned more than 70-80 years ago. Clearly, the term has fallen out of favor since then.