A yellow-orange coloured drink, sold in pints, made by mixing a bottle of the alcopop Smirnoff Ice and a bottle of a high-caffeine alcoholic energy drink called Raw Spirit. Unique to, and college drink of, University College (colloquially known as 'Castle'), a college of the University of Durham. The drink is only available in the college's bar, the Undercroft, otherwise known as the 'Undie'.
When you decide that you can skip going to the gym, because you had some sweaty, exhilirating sex, that you feel you've worked out hard enough, and have burned those calories just by banging
Trent: "Morning babe, want to go work outwith me?"
Abby: "How about you just work me out and do some sexercise instead?"