The phrase "to get the juice" means to acquire or obtain the essential or important information or details about a particular thing or situation. Full definition
If that doesn't get your juices flowing, I don't know what will. (thatvideogameblog.com)
Well, I did get juice from the orange I had at lunch on them. (looplooks.net)
This recipe isn't brain science, but it's a sure way to increase & spark the brain cells back up & literally get the juices going once again. (nestofposies-blog.com)