Definition of hot diggety dog in English:

hot diggety dog

Pronunciation /ˌhɒt ˌdɪɡətɪ ˈdɒɡ/

exclamation

  • An exclamation of joy or surprise.

Origin

1920s; earliest use found in The Washington Post. Alteration of hot dog, with alteration of the vowel of the second syllable and suffixation.