What is the meaning of idiom picture on

The idiom "picture on" is not a common idiom in the English language. It's possible you're thinking of a similar idiom or phrase, or maybe you've misheard something.

Could you please provide more context or clarify what you meant? For example:

* Where did you hear this phrase? (A book, a movie, a conversation, etc.)

* What was the situation where it was used?

* Did you mean to say something else?

With more information, I can help you understand the meaning of the phrase you're looking for.