九霄云外 is a four-character idiom (成语) that literally means 'beyond the nine layers of the sky'. Figuratively, it describes something that has been completely forgotten, ignored, or abandoned — as if thrown to the farthest reaches of the heavens. It almost always appears in the structure 把…抛到九霄云外 (throw something to the winds) or 忘到九霄云外 (forget something completely). Use it when someone deliberately or utterly disregards a concern or obligation.