What does the idiom get out of bent mean?

The idiom "get out of bent" is not a common or standard idiom in the English language. It's possible that you've misheard or misunderstood a similar idiom.

Perhaps you meant one of these:

* Get out of hand: This means to become uncontrolled or unmanageable. Example: "The party got out of hand and the neighbors started complaining."

* Get out of line: This means to behave in a way that is not acceptable or appropriate. Example: "He got out of line and started arguing with the manager."

* Get out of shape: This means to become physically unfit or unhealthy. Example: "I got out of shape after I stopped going to the gym."

* Get bent: This is a slang term meaning "go away" or "screw you." It's considered rude and should be avoided in most situations.

If you can provide more context about where you heard this idiom, I may be able to help you understand its meaning.