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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.
It’s my fault, my mistake. The term was taken over from Latin as far back as the 1200s and continues to be used in this way. Ian Rankin had it in Strip Jack (1992), “‘You haven’t had a proper lock fitted yet.’ ‘Mea culpa, Inspector. Fear not, one’s on its way.’” A newer slangy version of this ancient Latin expression is my bad, only a few decades old but ubiquitous enough to be considered a cliché. Novelist John Lescroart used it in The Hunt Club (2009): “‘Yeah, you’re right, I’m sorry. My bad.’ Juhle hung his head.”