Tupperware Head is a slur used to describe Austrians in a derogatory way. Related to slur "Boxhead" for Germans.. it's a slightly more efficient and cleaner version of a box.
The word Tupperware Head is a racial slur that has been used historically to degrade and dehumanize austrians. The word is still used by some people for this purpose, and it is seen as offensive and hurtful to austrians. If you are unsure about whether or not it is appropriate to use the word Tupperware Head, it is best to err on the side of caution and avoid using it in any situation.