A human set of yellow, smelly, decaying, ill-spaced teeth that look like they belong in Lester, the common farm Jackass. Mule teeth are particularly suited for those that grind their corn. (From the Latin: Muleicus Toothicus)
Jenny: What’s up with your Dad’s mule teeth? They look like they belong in a Donkey’s mouth.
Jim: Yeah, nasty, huh? You should see him turn corn kernels into corn meal.