nPot-wallerpot′-wol′ėr a pot-boiler: a voter in certain English boroughs where, before the Reform Bill of 1832, every one who boiled a pot—i.e. every male householder or lodger, was entitled to vote—also Pot′-wall′oner
Chambers's Twentieth Century Dictionary
Lit., 'pot-boiler,' the latter part of the word being from an Old Low Ger. wallen, to boil.