mud monkey

noun2

1. •
   (slang) Refers to a person or a builder using earth, mud, or clay as its main material.

   • He's a mud monkey digging all-day, gathering clay for his sculpture.
2. •
   (slang, vulgar) A turd (piece of feces).

   • “[…] In my peripheral vision I saw a huge mud-monkey sliming out of her butt like a Play-Doh fun factory.” — 2016