Canasian is a slur used to describe Mixed races in a derogatory way. Canadian/Asian mix. Used in the US to describe annoying Asians that come down from Canada to shop.
The word Canasian is a racial slur that has been used historically to degrade and dehumanize mixed races. The word is still used by some people for this purpose, and it is seen as offensive and hurtful to mixed races. If you are unsure about whether or not it is appropriate to use the word Canasian, it is best to err on the side of caution and avoid using it in any situation.