SE in slang uses
1. one who frequents discotheques.
|Texas Mthly Nov. 155: If it wasn't for me, there would be no Gilley's, there would be no Urban Cowboy, and Travolta would still be some kind of disco biscuit.|
|Sassy n.d. 221/3: That song is you at your disco biscuit best.|
2. a Qualuude (methaqualone).
|Newsweek 28 Sept. 93/1: They prescribe a bottle of Quaaludes, a powerful and popular sedative known technically as methaqualone—and to legions of abusers as ‘pillows’, ‘disco biscuits’ and ‘vitamin Q’ .|
|Payola! 50: ‘Lude, vitamin Q, disco biscuit, gorilla pill [...] When it comes to drugs, I'm just a precious novice’.|
3. (drugs) MDMA.
|Parliament of Whores 118: Who wouldn’t rather have a couple of plump, flaky lines on a mirror and half a disco biscuit than lead the lives these people are leading?|
|Disco Biscuits v: Dennis The Menaces, Rhubarb and Custards, White Callies, Pink Flamingoes, Snowballs, Kinder Eggs, Energizers, Hammer & Sickles, Disco Biscuits.|
|Soho 51: Not that Alex had ever done drugs, apart from Es or disco biscuits as they were known.|
|‘The Facts About Ecstasy’, In the Limelight [Internet] What is ecstasy? [...] It is also called E, XTC, Adam, Love Doves, New Yorkers, M25’s, Disco Burgers, Dennis The Menace to name a few.|
|Mystery Bay Blues 26: Just because I drop the odd disco biscuit and hit a rave now and again [...] doesn’t mean I don’t like [...] rock ’n’ roll.|
(US) a male fan and frequenter of nightclubs.
|Skin Tight 82: In contrast to the disco Dannies, the mates wore T-shirts and sandals and deep Gulf Stream tans.|
|Crumple Zone 34: Checks me out first like a bint asking him for a wrap of disco powder up the Plastic Coconut in Tottenham.|