Related Clues:

• Response to a skeptic
• Emphatic assertion
• ''I agree''
• 'No joke!'
• "__ Easy": Buddy Holly classic
• 'And that's the truth!'
• "Honestly"
• "True dat!"
• 'For real'
• Title words before 'Easy' for Linda Ronstadt and 'Hard' for John Lennon
• Emphatic follow-up
• 'I swear it's true!'
• ''Cross my heart''
• "Believe you me!"
• "All kidding aside"