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Phrase(s): Hot diggety (dog)! [and] Hot dog!; Hot ziggety!
Inf. an expression of excitement and delight. (These expressions have no meaning and no relationship to dogs or to wieners.) • Rachel: I got an A! Hot diggety dog! Henry: Good for you! • Tom: You won first place! Mary: Hot ziggety!
McGrawhill's American Idioms And Phrasal Verbs