Possible Clues:

• 'That's not news to me'
• "You don't have to tell me"
• ''No need to remind me''
• 'No need to tell me'
• ''That's not news to me''
• It may follow "Yeah, yeah"
• 'No kidding!'
• "No duh!"
• "No need to tell me"
• "Tell me about it!"