Heard this one from a Plains Native American: Shovelhead for PNW Natives because she said, and I quote, "they look like they got hit in the face with a shovel".
My fellow Americans tend to mix them up so a helpful guide to knowing your yellow people slurs:
Chink = Chinese
Jap or Nip = Japanese
Gook = Korean
Zipperhead = general Asian but usually Viet or some other jungle Asian
And for non-Americans the various types of poor white trash:
Hillbilly = Not interchangeable with redneck, a hillbilly lives in the hills of Appalachia, think Deliverance.
Redneck = like a hillbilly but can live anywhere.
Trailer trash = See above, but can sometimes be Native or Mexican, occasionally black but poor blacks tend to live in the ghetto not in trailer parks.