The Darkside is a scenario in which
people have partaken in
drugs, or
alcohol. It's often used in conversation between co-workers, and peers to hint at doing such activities.
James: Hey,
Man. How was your weekend?
Barry: Dave and I went over to the darkside whilst the wife was out.
Vince: How do you fancy coming over to the darkside tonight mate?
Marcell: Nah mate, gotta go to
work at six tomorrow.