What is the meaning of idiom doing too

The phrase "doing too" is not a common idiom in English. It's likely you're thinking of a similar phrase or a misspelling.

Could you be thinking of one of the following?

* "Doing too much": This idiom means being excessively busy or active, often to the point of being overwhelming or stressful.

* "Doing too little": This implies not putting in enough effort or doing something inadequately.

* "Doing too well": This could mean being overly successful, or it could be a sarcastic way of saying someone is being arrogant or smug.

Please provide more context or the full phrase you are trying to understand, and I can give you a more accurate answer.