BoP n 1: the law enforcement agency of the Justice Department that operates a nationawide system of prisons and detention facilities to incarcerate inmates sentenced to imprisonment for federal crimes [syn: {Federal Bureau of Prisons}] 2: an early form of modern jazz (originating around 1940) [syn: {bebop}] v 1: dance the bebop [syn: {bebop}] 2: hit hard [syn: {sock}, {whop}, {whap}, {bonk}, {bash}]