Out the window
突然失去了、或者是浪费了某样东西

we had a big fire and all our money and hard work went out the window.

Out of this world
不切实际
好的不得了 十全十美的, 极其动人的, 无比优秀的, 无比精彩的
His idea is always out of this world.
I think the flavor of fresh strawberries is out of this world.