Engine room hooch

Engine Room Hooch was an alcoholic beverage. It was usually produceded clandestinely on board starships in stills, usually by a member of the engineering department. In the 2250s century various officers on a number of different ships produced Engine Room Hooch. The production of Engine Room Hooch was officially frowned upon by Starfleet, but in actual practice a blind eye was often turned to the production of the beverage.

Shortly after being posted to the USS Enterprise (NCC-1701), Lieutenant Montgomery Scott began producing Engine Room Hooch. He located his still near the warp core. The beverage became very popular, Number One commented that the hooch was better than that of the Lionheart's. Shortly after production was begun, a dilithium crystal cracked, which bombarded the still with gamma radiation, and contaminated the beverage produced within. It resulted in the alcohol being very potent, a couple drinks resulted in extreme intoxication.

As a result, the still and the bottles were confiscated and destroyed. Chief Engineer Barry announced that production of Engine Room Hooch would no longer be tolerated.

Source

 * TOS novel Vulcan's Glory