Well the story goes that the Devil was flying over Ireland trying to steal the souls of the people and tempt them. However good old St. Patrick had done such a good job that the Devil couldn’t tempt anyone so in a fit of rage he bit into the mountain here in Tipperary and spat it out all of the way down to Cashel in South Tipp. So this hunk of rock is said to be what makes up the Rock of Cashel.
Possibly this is a christained story of the usual giant story throwing rocks around.