Your right it wasnt widely called Hip-Hop back then but just Rap as it didnt have much of an identity then as ithe genre was in its infancy. Afrika Bambaataa is credited with coining the Hip-Hop phrase and the four elements, DJ ing, Breakdancing, Rapping and Grafitti so it is an old phrase, possibly very early eighties? I love old school Hip-Hop and grew up on it so its a huge passion of mine! I was trying to think about the use of the term Ho and i reckon it started in the late eighties, possibly Two Live Crew, Slick Rick, NWA.... I need to dig out the vinyl!