Possible Clues:

• "Uh-huh!"
• ''That's what I'm talkin' about!''
• Affirmative response (informal)
• "Whoo-hoo!" alternative
• 'I suppose so'
• When sung three times, part of a Beatles refrain
• 'Hell ___!'
• Yes, slangily
• 'You betcha'
• 'You bet'