The Brief: Formerly a slang term for Quaaludes, Disco Biscuits is now a nickname for ecstasy.

Bluesquiggle
DEEP DIVE

The term disco biscuits originated as a reference to Quaaludes when they were popular in the 1970s and at discos.

Quaaludes are no longer manufactured, but ecstasy, a party drug is sometimes referred to by the same name (disco biscuits) because of its popularity at concerts and raves.

https://twitter.com/pandymccubbin/status/1107402826567860225

Someone high on disco biscuits is said to be zooming.

https://twitter.com/shaunamccann/status/1107485685030760451