Word

へそで茶を沸かす

臍で茶を沸かす
へそでちゃをわかす
to do something ridiculous; to do something bizarre; to boil tea in one's navel
Word

沸き

わき
boiling
Word

突沸

とっぷつ
explosive boil (after a liquid has been heated to its boiling point); bumping