I've been in this field before looking at the lumps and bumps and have said to myself there's something going on here. It's just up the road from me, less than a 10 minute drive. I've surveyed the archaeology.ie website for sites in my vicinity and this comes up as a "Cairn, unclassified" and has no notes.
It's about 1.4 metres high, oval, maybe 6 metres on its longer axis, by 4 metres on the shorter. There's a much-flattened ring barrow about 350 metres to the north-west and there are some signs of habitation sites/earthworks in the immediate area.
I'm not entirely convinced by this, though it's hard to disagree that it is artificial – the stones that I saw on the western side of the cairn looked suspiciously like bedrock to me. Maybe this was incorporated into the cairn/barrow and there is a burial at its core.