Slang phrase nigger while in the woodpile "a concealed motive or unfamiliar component influencing a scenario in an adverse way" [OED 1989] is attested by 1800; Thornton's "American Glossary" (1912) defines it as "A mode of accounting for the disappearance of gasoline," hence "an unsolved mystery.The slang term "Niga" is often a extremely offensive