mud-kicker

noun4

1. •
   (slang) An unskilled laborer; One who makes his living by outdoor manual labor.

   • They're army guys, mud-kickers, for God's sakes. — 1998
2. •
   (slang, offensive) Streetwalker; a prostitute who looks for customers in public places, especially one who works for a pimp.

   • Lay off the broads and the high priced mud-kickers. — 1974
3. •
   (slang) A workboot designed for outdoor work, especially one that can be worn on muddy ground.

   • He was short, this guy, and wiry, in along, fitted wool coat and fashionable mud-kickers of the kind Clyde wore. — 2011
4. •
   (slang) A racehorse.