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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!
my badused to acknowledge responsibility for a mistake. North American informal
ˈmy bad(American English, informal) used when you are admitting that something is your fault or that you have made a mistake: I’m sorry — my bad. ♢ No, it’s my bad. I’m the one that got caught taking stuff.
phr. It’s my fault and I’m sorry. My bad. It won’t happen again.
Used to acknowledge that one is at fault.