This is a real-world term used by the police in the UK. Refs = Refreshments.
At midday we stopped off for refs at Dominic’s mum’s bungalow. She was
out serving refreshments of her own to the search teams, so we raided
her stupendously large American fridge, which was the size of a
cryogenic pod and had an ice maker and everything. It was also
ridiculously full for one old lady overseeing a totally theoretical
B&B business.
Foxglove Summer
You can see it being used in current UK policing documents and handbooks.
In work rest breaks (refs)
Whilst the 20 minutes rest break is based
on the working time regulations provision, the Kent Police position is
that staff should take an unpaid rest break of not less than 30
minutes after working continuously for 6 hours
Kent Police Handbook - Working Time Directives
The earliest reference I've found is from The Force: Inside the Police (1989). The book provides us with a wealth of police slang used across a range of different police forces.
At Streatham, officers sat, notebooks on knees, while a sergeant read
out the day’s duties, calling each officer by his number rather than
name. He also designated each officer’s time for refs (refreshments) -
police officers measure out their lives with tea and chips. One
December night, ‘A’ relief, with six PCs and one WPC on parade, was
coming on duty. A PC assigned to walk the High Road rolled his eyes
and moaned; the inspector said with a smile: ‘The fresh air will do
you good. I thought you’d enjoy a walk after being tied up in the
“comms” [the communications room] all week.