numero uno

[noo-muh-roh oo-noh, nyoo-] /ˈnu məˌroʊ ˈu noʊ, ˈnyu-/
noun
1.
number one (defs 1–4).
Origin
1970-75; < Italian
Slang definitions & phrases for numero uno

Numero Uno

noun phrase
  1. One's own self, esp as the object of one's best efforts; number one
  2. The chief; leader; boss, honcho: a clear understanding between the brothers about who is Numero Uno
  3. he most distinguished person ina field or endeavor: now an also-ran, but for many years Numero Uno

[1883+; fr Italian or Spanish]