o hit it out of the park means to perform extremely well. It is used to describe doing something not just good, but especially excellent. This phrase comes from the sport of baseball -if a player hits the ball out of the park, it‘s the best possible thing.
Hit it out of the park意思是表现非常好。它不仅用来描述做事好，并且特别出色。这个短语来自棒球运动。在棒球运动中，homerun意为“本垒打”，即击球手将球击出后安全回到本垒。而hit it out of the park，根据字面意思，把球击出了球场，当然就是绝好的全垒打喽。因此，这两个短语就有“出色地完成某事”的意思了。
Great job on that report, Jacob- - you really hit it out of the park.
报告写得很好，雅各布。你真得非常出色。
I'm pretty sure I hit that test out of the park.
我很肯定我非常出色地完成了那个测试。