1An honorific term for a nobleman or dignitary; somewhat old-fashioned but conveys respect.
殿様がお出ましになると、皆が一斉に頭を下げた。
When the lord appeared, everyone bowed at once.
2Historically, a feudal lord (daimyo) of the Edo period or similar eras.
江戸時代の殿様は領地を治めていた。
Daimyo in the Edo period governed their domains.
3A colloquial term for someone who is sheltered, arrogant, or pampered and ignorant of the ways of the world.
彼はいつも人に尽くしてもらって、まるで殿様みたいだ。
He's always being waited on by others — like a spoiled lord.
そんな暮らしをしていたら殿様になるよと母に笑われた。
My mother laughed and said that if I kept living like that I'd turn into a spoiled lord.