El dingo

Gringo: A perjorative term used in Latin America to refer to white English
speakers, particularly Americans. There are records of the term being used in
Spain in 1787. At that time it was applied to foreigners who had not mastered
Spanish and were hard to understand. Specifically in Madrid, it was applied to
Irish people living in the city.

The origin of the word is most probably griego, Greek, in the sense of a
foreign or unintelligible language. The story attributing its origin to the song
"GREEN GROW the lilacs" which was popular among American soldiers during the
US's war with Mexico is not true, as this was fought between 1846 and
1848.

From the Oxford Spanish dictionary. I wonder if Australians count as gringos. Es cierto que somos dingos.