かかあ天下 (kakaa denka)

kakaa=mother or wife, denka (tenka)= Royal Highness

During the Edo period in Japan, women were subservient.

But from the Meiji period on, women have gradually been getting more and more rights and power. 

Now in the home, the woman has more power than the husband. 

A famous Japanese group, Funky Monkey Babys included it in the lyrics to one of their songs- "Hero." 

「かかあ天下のお茶の間　第3のビールで乾杯しよう」

"Kakaa Denka no ocha no ma, Dai-san no biiru de kanpai shiyo..." 

(Drinking cheap beer alone, because her Royal Highness is in the living room...)

The song is praising the Japanese office worker husband who works hard for his family from early morning to midnight.

But he only buys cheap beer because he is afraid of angering the Queen of the household.