Slang phrase nigger inside the woodpile "a concealed motive or unfamiliar issue impacting a condition within an adverse way" [OED 1989] is attested by 1800; Thornton's "American Glossary" (1912) defines it as "A method of accounting to the disappearance of gas," consequently "an unsolved thriller.In conclusion, the use of the phrase "Niga" is rarel