Possible Clues:

• ''See if I care!''
• 'I was wrong ... big deal!'
• 'My mistake—big deal!'
• Flippant alternative to 'I'm sorry'
• "See if I care"
• "Sorry, not sorry"
• 'What're you gonna do about it?'
• 'I goofed ... big whoop'
• "What're ya gonna do about it?"
• 'What're ya gonna do about it?'