[はいていらおゆえ, haiteiraoyue] (n) totally useless (fruitless) effort; wasting time on an impossible task (like trying to scoop up a reflected moon from the bottom of the sea)
[はいていらおゆえ, haiteiraoyue] (n) Haitei winning hand in mahjong; winning on the last tile drawn from the wall; scooping the moon from the bottom of the sea