“Pot Walloper” is a term gradually falling from repute.
In its original form, potwaller, in the early eighteenth century, it designated an Englishman who, by virtue of having his own pot to boil (to wall, in the speech still current then), was entitled to vote in a parliamentary election.
An early alteration of potwaller was pot-walloper. For a hundred years it carried the same meaning.
But then one who boiled a pot was thought, by some, to be in a demeaning occupation and, accordingly pot-walloper became a term of contempt, indicating one with the mind or ability of a scullion.