The phrase "to hit a homerun" means to achieve a great success or accomplish something really impressive and valuable. It comes from baseball, where a homerun is the most desired outcome, as it earns the team an automatic point. Full definition
Pocketbook really hit a homerun with being able to really configure this experience, resulting in a ton of different options to warm up the screen. (goodereader.com)
You really hit a homerun with this as well as on T&J! (mom4real.com)
As one of SNL's best current assets, Wiig has been doing her fair share of comedies lately and, even if the films themselves don't take off, she usually hits a homerun in whatever role she has. (justpressplay.net)