Refers generically to DJ turntables, etymology is a derivative of the best-selling professional-grade DJ turntable, the Technics SL1200, which has for better or worse become the de-facto standard in the club world. See also wheels of steel
Tonight we've got DJ Judge Jules playing live on the ones and twos, live on BBC Radio One.
beat juggling two tracks __ track one to track two __ cutting up scratches from fader one to fader two __ straight dropping beats from track one to track two __ left to right __ right to left __ on that one two type ish—mixing the beats up back n' forth.
yo that turntablist be banging tracks back n' forth on those ones and twos—ill style.
When some resigns or retires from a job, they are on "eternity leave". This can also refer to someone who has passed away, especially someone who worked somewhere for a long time, retired/resigned, then passed away later.
Oh I'm sorry, you didn't know that Kelly is on eternity leave? She resigned and moved to Hawaii!
With regrets I would like to inform you that my boss is officially on eternity leave. I will never see or hear them again. Ever.