Hol up, hol up... So den... Den youze be sayin, then... Hol up.... So then youze be saying weez niggaz.... Hol up, wayminite, you beez sayin, hol up imma finna git dis so you... You beez sayin........... The creation of slang, particularly in a country and culture, and a subculture, as racially diverse as America and early jazz respectively, can't be attributed with certainy to any particular race, and the immediate assumption that it must be black people is unfounded and likely a result of modern revisionism and the romanticized belief that everything old and associated with street and city culture is likely black in origin.
Sheiiiiiiiiiiiiid homie.