Me and my big mouth
Definition 1 of 1
Pro Tip 1/3Slight Humor
The phrase often carries a humorous tone, showing embarrassment with a light-hearted touch. 
Me and my big mouth! Now you know your surprise gift.
Pro Tip 2/3Self-reproach
It's a self-critical remark implying acknowledgment of one's mistake in speaking too freely. 
I should have been quiet about the change in plans - me and my big mouth!
Pro Tip 3/3Casual Expression
This phrase is conversational and not used in formal writing or professional settings. 
Me and my big mouth, I just told her about the office joke!