noun
lordly air; haughty manner
Describes a person's attitude or behavior as if they were a feudal lord, often implying arrogance or an imperious demeanor.
彼は殿様風の態度で部下に命令した。
He gave orders to his subordinates with a lordly air.
高慢 is a more direct term for arrogance or pride, whereas 殿様風 specifically evokes the image of a lordly, imperious attitude.
Compound of 殿様 (tonosama, 'feudal lord') and 風 (fū, 'style, manner'). The exact historical derivation is uncertain, but the term transparently means 'in the manner of a lord'.