Tell that to the oxy chap downstairs and touch him for a guinea. 1922 February 2, James Joyce, “[Episode 1: Telemachus]”, in Ulysses, Paris: Shakespeare and Company […], →OCLC, part I [Telemachia], page 7:
(abbreviation, alt-of, clipping, countable, informal, uncountable) Clipping of oxyacetylene, a mixture of oxygen and acetylene used for cutting and welding metals.
One of the detectives, Sgt. Joseph Ballou, discovered that during a drug raid in 2012, Springfield cops had confiscated 51 oxycodone pills — the gold standard of prescription opioids. ¶ The oxies were turned over to Farak for analysis and she issued a certificate saying the pills were not illegal. 2017 July 2, Howie Carr, “Carr: Judge sees misconduct, AG sees none”, in Boston Herald:
(abbreviation, alt-of, clipping, countable, informal, uncountable) Clipping of oxygen.