Get, pull, etc. your finger out
Definition 1 of 1
Pro Tip 1/3Colloquial Urgency
Used to express urgency in casual, often work-related contexts; not suitable for formal situations. 
The deadline's tomorrow, time to get your finger out!
Pro Tip 2/3British Origin
It's a British phrase not commonly used outside the UK, so be mindful of your audience. 
Our British manager told him to pull his finger out.
Pro Tip 3/3Potential Rudeness
The phrase can be seen as rude or harsh; use it only when a firm push is acceptable. 
She told her team to pull their fingers out or face consequences.