The name, loosely translated from Irish, refers to a cooking place of the wild deer, though the exact meaning has long been debated. The basic technology is remarkably consistent across thousands of known examples in Ireland: a trough, usually timber-lined or cut into the ground, would be filled with water, and stones heated in a nearby fire would then be dropped in to bring the water to a boil. The discarded, shattered stones accumulate over time into the horseshoe-shaped mounds that survive today, often in low-lying or marshy ground where water was readily available.

Fulachtaí fia are among the most commonly recorded prehistoric monuments in Ireland, with the majority dating to the Bronze Age, roughly 1500 to 500 BC, though some have been found with Neolithic or Iron Age associations. Their precise function is still a matter of some discussion. Cooking is the dominant theory, but experiments and analysis have suggested they may also have served for brewing, textile processing, or bathing. The townland name Caheraphuca combines the Irish words for a stone fort and a supernatural being, the puca, a shapeshifting creature of Irish folklore, hinting at a landscape already layered with older significance by the time medieval place-names were being fixed. That a fulacht fia should sit in such a townland is the kind of quiet coincidence that Irish archaeology routinely throws up.