1. in senses of theatre/film jargon set, the backdrop to the action.
(a) [1950s+] (US black) wherever the hedonistic, criminal or night life takes place.
(b) [1950s+] (US black) a party, a gathering.
(c) [1960s+] (drugs) a place where drugs are sold.
(d) [1980s+] (US black) the neighbourhood.
2. see dead set n. (1)
[1950s+] (US black) to move to or arrive at a gathering.
[1990s+] (UK black) to ruin an atmosphere.
[1970s+] (US black) to attend a party.