Chinee is a slur used to describe Chinese in a derogatory way. An archaic singular for the plural Chinese, now considered offensive. Also said to be an emphasis of many Asian's inability to pronounce English.
The word Chinee is a racial slur that has been used historically to degrade and dehumanize chinese. The word is still used by some people for this purpose, and it is seen as offensive and hurtful to chinese. If you are unsure about whether or not it is appropriate to use the word Chinee, it is best to err on the side of caution and avoid using it in any situation.