The Collaborative International Dictionary of English v.0.48:

Gibaro \Gi"ba*ro\, n.; pl. Gibaros. [Amer. Sp. j['i]baro
   wild.] (Ethnol.)
   The offspring of a Spaniard and an Indian; a Spanish-Indian
   mestizo. [Sp. Amer.]
   [Webster 1913 Suppl.]