Green’s Dictionary of Slang

a large foot, a large, heavy shoe.

1845		G.W. Harris ‘The Knob Dance’ Spirit of the Times (N.Y.) XV July in Inge (1967) 48: Well, let hir keep hir tail clar of my ant killers!
1966		in DARE I 71/1: ants-mashers.
1980		L. Wright Mr Jelly Lord 64: [H]e named Walter Thomas ‘Leatherfoot’ because of his big feet, ‘real antmashers,’ and that this later became shortened to ‘Foots’.