Definition of nyah-nyah in English:

nyah-nyah

(also nyah-nyah-nyah)

verb

  • with object To behave in a childishly supercilious or derisive manner towards someone; to taunt someone.

Origin

1980s; earliest use found in Adweek. Reduplication of nyah.

Pronunciation

nyah-nyah

/ˈnjɑːˌnjɑː//ˌnjɑːˈnjɑː//ˌnjaˈnja/