Disco biscuits

n.

Heard in Dublin, Galway, Carlow and Donegal

Ecstasy (mdma) tablets, an illegal drug. Also referred to as bickies, yokes.

In use

Got bleedin hammered las nigh on the oul disco biscuits

Posh English

I became quite thoroughly inebriated last evening upon those festive pharmaceutical tablets.

Same phrase, other counties