Circa early 50s, refers to younger people who listened to jazz records and had a casual or modern style of dress. Resurfaced in earlier Digable Planets lyrics with reference to West Philly.
Slidding is a word which describes the action of a Log of Andy Sixx's poop decending down your throat, as per the popular 4chan meme "Andy Sixx's Log". The extra "d" in the word, compared with the usual spelling is to account for the intensity of the experience.