Related Clues:

• Folksy yes
• Exclamation of derision
• 'Boo- —!' ('All right!')
• Hard, always, to upset toff
• Slangy 36-Across in "Fargo"
• Informal word of agreement
• 'Boo-__!': cry of celebration
• "Boo-__!": cry of celebration
• '___, sure, you betcha!' (classic Minnesotan expression)
• "Boo-__!"
• "Boo- —!"