Informal.
1. an actual or idealized person with an impeccable record, reputation, or image, esp. a politician (sometimes used with Miss, Ms., or Mrs. instead of Mr. when referring to a female).
2. such a person regarded as excessively virtuous; goody-goody (sometimes used with Miss, Ms., or Mrs. instead of Mr. when referring to a female).
[ 1970-75; popularized as the trademark of a liquid cleaner ]