or moo-heater, subs. (old).See quot.
c. 1696. B. E., A New Dictionary of the Canting Crew, s.v.
1811. GROSE and CLARKE, Lexicon Balatronicum, s.v. MOW HEATER. A drover: from their frequent sleeping on hay mows. Cant.
1870. All the Year Round, 5 March. Bye-gone Cant, s.v.