Get our ass in gear American informal slang rude
To tell someone to hurry up and get moving.
We're already behind schedule. So get your ass in gear!
You'd better get your ass in gear if you want to meet the deadline.
To ask somebody to do something quickly in an impolite manner
If you fall for someone's trick the first time then they are at fault.
Are you going to mess with me again? Fool me once, shame on you; fool me twice, shame on me.