A Piper on the Hob is a house cricket. During the colder nights the presence of a cricket was said to be a sign of good luck. Confusingly, there is another musically unrelated Irish jig of the same name (see the last link below).
This tune is generally associated with Coleraine in Northern Ireland and apparently also some of the prejudices between different groups on one side or the other of that particular divide. However, there is only one printed reference to the jig as being Irish, and its long association with New England contra dancing may indicate it originated there instead. The town of Coleraine in Massachusetts (also Colrain) was first settled by a colony from the north of Ireland, about the year 1736.
This melody appears in the 1734 Drummond Castle Manuscript, which is still in the possession of the Earl of Ancaster at Drummond Castle. The castle is named after the laird who built it, Sir John Drummond and stands at Strathearn. The nearest village is Muthill (pron. mew thill), and it’s close to Crieff.