Related Clues:

• One of a mule's parents
• Fool to go by, scratching head
• Idiot biting girl’s head off
• 'Don't be a smart-___'
• Zebra’s kin
• 'Big-___ Rock' (song from 'The Full Monty')
• Total boor
• Buridan's __: philosophical paradox
• Hee-hawing beast
• A male one is called a jack
• Animal of the horse family
• Some fashionistas smoke dope
• Feisty foal
• Donkey in Christmas setting
• Jerkwad