Green’s Dictionary of Slang

ant-killer n.

also ants-masher
(US)

a large foot, a large, heavy shoe.

[US]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!
[US]in DARE I 71/1: ants-mashers.