Onionhead is a slur used to describe Urkranians in a derogatory way. Based on their buildings having large onion-type roofs
The word Onionhead is a racial slur that has been used historically to degrade and dehumanize urkranians. The word is still used by some people for this purpose, and it is seen as offensive and hurtful to urkranians. If you are unsure about whether or not it is appropriate to use the word Onionhead, it is best to err on the side of caution and avoid using it in any situation.