Nica is a colloquial term for a native Nicaraguan

Nicaraguan

Nicaraguans are people inhabiting in, originating or having significant heritage from Nicaragua. Most Nicaraguans live in Nicaragua, although there is also a significant Nicaraguan diaspora, particularly in Costa Rica and the United States with smaller communities in other countries around the world...

. The term is used extensively in Nicaraguan Spanish

Nicaraguan Spanish

Nicaraguan Spanish is geographically defined as the form of Spanish spoken in the country of Nicaragua in Central America. Affectionately, Nicaraguan Spanish is often called Nicañol....

 in informal settings, particularly in settings regarding people of Nicaraguan origin. The plural of Nica is Nicas, which can be used to refer to a masculine or feminine group of Nicaraguans. The term is also widely used by Nicaraguans abroad in the United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

, Costa Rica

Costa Rica

Costa Rica , officially the Republic of Costa Rica is a multilingual, multiethnic and multicultural country in Central America, bordered by Nicaragua to the north, Panama to the southeast, the Pacific Ocean to the west and the Caribbean Sea to the east....

, Argentina

Argentina

Argentina , officially the Argentine Republic , is the second largest country in South America by land area, after Brazil. It is constituted as a federation of 23 provinces and an autonomous city, Buenos Aires...

 and other Latin American countries. The term is coined on a less frequent bases by non-Nicaraguans, who use the formal term Nicaragüense when referring to a singular person or Nicaragüenses in plural form.