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get on the ball, shitbird, before you get the hook 

scatological expression of the Eagle, Globe, and Anchor -- The USMC emblem.
If I were you I'd get myself squared away. In other words: get on the ball, shitbird, before you get the hook.

To Get on the Ball 

This amusing little phrase says that someone needs to improve something.
Your work is so sloppy. Get on the ball!
Tom has been too lazy. He needs to get on the ball.