The phrase "killer ball" refers to a highly accurate and powerful pass in sports, usually in soccer or basketball, that is aimed at creating a scoring opportunity for the receiving player or team. Full definition
We'll need Ozil to get back to killer ball mode. (justarsenal.com)
I'd put Özil in ahead of Wilshere because even a half fit Özil can find a couple of killer balls a match. (justarsenal.com)
I made them into a spicy vegan chorizo for these vegan breakfast tacos and they can be rolled into killer balls like for this vegan meatball sub. (thestingyvegan.com)