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That was my mistake; I admit that that was my fault. Primarily heard in US. Susan: "Jerry, I asked you to do the dishes an hour ago, and they're still piled in the sink!" Jerry: "Oops, my bad, honey. I'll do them right now."
my badVERY INFORMAL
People say my bad to mean that something is their fault. Whoops! Sorry dudes! My bad!
phr. It’s my fault and I’m sorry. My bad. It won’t happen again.
Used to acknowledge that one is at fault.