The term, loosely translated as "wild deer cooking place", refers to a type of ancient cooking site, typically identified by a horseshoe-shaped mound of burnt and shattered stone beside a trough, often cut into boggy ground near a water source. The standard interpretation holds that stones were heated in a fire, dropped into a water-filled trough to bring it to the boil, and used to cook meat. One such site sits in the townland of Cunnagher in County Mayo, a quiet addition to a class of monument that dots the midlands and west of Ireland from the Bronze Age onward.

The burnt-stone mound is the most visible trace these sites leave behind. Over time, repeated heating and quenching causes the stones to crack and fragment, and the discarded material accumulates into the characteristic low, rounded mound that survives in fields and bogs long after every other trace of activity has vanished. Some archaeologists have proposed alternative uses for fulachtaí fia, including textile dyeing, leather working, or bathing, and the debate has never been fully settled. Whatever their precise function, they represent a form of organised, repeated activity that implies a degree of social coordination, and their sheer number across the Irish landscape, many thousands of confirmed examples, suggests they were a routine feature of life rather than an occasional or ceremonial one. The Cunnagher example in Mayo takes its place within that broader pattern, a Bronze Age feature now sleeping quietly in the west.