Definition of hot-cha-cha in US English:

hot-cha-cha

(also ha-cha-cha)

noun

  • A cry of ‘hot-cha-cha’; an expression of energy and high spirits.

Origin

1920s (in an earlier sense). Apparently from hotcha, with reduplication of the second syllable.

Pronunciation

hot-cha-cha

/ˌhɒtˌtʃɑːˈtʃɑː/