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1. The highest rated or regarded; the best. Spanish for "number one." It can be used as a noun or an adjective. If you're looking for a good burger, this place is numero uno. Happy birthday to my numero uno friend!
2. Oneself. In this usage, the term implies that one's top priority or concern is or should be oneself. Used especially with the phrase "look out for numero uno." The only way you're going to get ahead in this business is by looking after numero uno. It doesn't make you a selfish person if you look out for numero uno from time to time.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
numero uno(ˈnumɚo ˈuno)
1. n. number one; the best. (see also number one.) This coffee is numero uno in my book.
2. n. oneself; number one. I always look out for numero uno.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.