wab
n.— «“Wab” is a slur that assimilated Mexicans use to describe and deride recently arrived Mexicans.…The etymology of wab is unknown—could either be a mongrelization of “wetback” or “wop.” » —“¡Ask A Mexican!” by Gustavo Arellano Orange County Weekly (California) July 22, 2005. (source: Double-Tongued Dictionary)
Further reading
Is Murphy’s Law, or the idea that “anything that can go wrong will go wrong,” a slur against the Irish? This is part of a complete episode.
Related
Mark in Bismarck, North Dakota, spent years as a sailor, and wonders about the term sea painter, meaning “a rope attached to a lifeboat.” Why painter? The word may derive from Middle French pendeur meaning “a kind of rope that...