It means a tail in the form of scissors. It is the name of a genus of birds in the family Caprimulgidae. They are known as chotacabras, blind hens, cuyeos, zumayas or atajacaminos.
Uropsalis : Genus of caprimulgiform birds of the Caprimulite family, native to South America, popularly known as chotacabras, atajacaminos, roadguards and sleepers.