n. 1. A criminal charge. “There ain’t no way for a city ghee (fellow) to beat (to be acquitted of) a rap in them jerkwater (small town) courts.” 2. A prison sentence. “A tenner (ten-year prison sentence) is a big rap for a prowl (burglary).” 3. The blame; stigma.

v. 1. To press a criminal charge; to testify against. "The sucker (victim) ain’t gonna rap. We hit him with (we gave him) five C’s (five hundred dollars) to take a powder (to flee the jurisdiction of the court)." 2. To blame; to stigmatize.

- american underworld dictionary - 1950