ching chong vs slopehead

ching chong

noun

  • A Chinese or other Asian person. 

intj

  • Mimicking Chinese, Korean, Thai or other East/Southeast Asian speech. 

slopehead

noun

  • A person of East Asian ethnicity, particularly Vietnamese 

How often have the words ching chong and slopehead occurred in a corpus of books? (source: Google Ngram Viewer )