'Goody-goody' definitions:

Definition of 'goody-goody'

From: WordNet
adjective
Affectedly or smugly good or self-righteous
noun
A person who behaves extremely well in order to please a superior

Definition of 'Goody-goody'

From: GCIDE
  • Goody-goody \Good"y-good`y\, a. Mawkishly or weakly good; exhibiting goodness with silliness. [Colloq.] [1913 Webster]

Definition of 'goody-goody'

From: GCIDE
  • goody-goody \good"y-good"y\, n. A person who is weakly, sentimentally, or affectedly good; a goody-goody person; -- sometimes used to refer to person who acts with good intentions but who bunglingly does more harm than good. The latter may sometimes be deprecatingly referred to as a goo-goo. [Colloq.] [PJC]

Definition of 'goody-goody'

From: GCIDE
  • Goody \Good"y\, a. Weakly or sentimentally good; affectedly good; -- often in the reduplicated form goody-goody. [Colloq.] [Webster 1913 Suppl.]