Possible Clues:

• Heart-to-heart
• "Not gonna lie ..."
• Direct messages?
• "To be honest with you ..."
• 'I'm gonna be honest with you . . .'
• 'Straight up ...'
• It's no bull
• "I'm gonna be straight with you ..."
• Preface to a heart-to-heart conversation
• 'If I'm being honest,' in modern slang