Definition of ownty-downty in English:

ownty-downty

(also ownty-donty, owntsy-downtsy)

adjective

US
nursery, informal
  • Own pron.

Origin

Early 19th century; earliest use found in David Humphreys (1752–1818). Reduplication of own with variation of the initial consonant and suffixation, in imitation of childish speech.

Pronunciation

ownty-downty

/ˌəʊntɪˈdəʊnti/