Slang phrase nigger while in the woodpile "a hid motive or unfamiliar issue impacting a predicament 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 fuel," hence "an unsolved secret. The slang expression "Niga" https://alfredi813kpt0.aboutyoublog.com/profile