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A way of admitting a mistake, and apologizing for that mistake, without actually apologizing. The best definition I ever read of this, now paraphrased:

"I did something bad, and I recognize that I did something bad, but there is nothing that can be done for it now, and there is technically no reason to apologize for that error, so let's just assume that I won't do it again, get over it, and move on with our lives."

Ruder than apologizing, but with the same meaning: a flippant apology.
"You just spilled your beer on my term paper!!"
"Er... my bad."
by Lita August 17, 2004
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(n.) A combination of an apology and a dismissal. Basically, saying "oh yeah, I did that, but I don't care".

Persons of an older generation can find this quite annoying to hear when expecting an actual apology.
"Hey, you spilled my Coke all over me!"

"Oh. My bad."

by Traffic-Cone-Liberation-Force November 16, 2004
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1. Slang for I'm sorry or my mistake. A form of apology.
2. Admitting you're in the wrong.
3. Another way of saying you made an accident.
1st person: "Dude why didn't you call me last night, I waited for three hours!"

2nd person: "Mybad I passed out as soon as I got home last night."
by Leesee April 04, 2009
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My Bad was originally My Bag. It means my fault. Yes, it also means “I'm not into to that kind of thing.” as in “That's not my bag man.” The movie Clueless got it wrong, thrusting it into the mainstream as "My bad". The phrase "My bag" was used commonly as far back as the 1940s. My father, his family and friends all used it back then in Minnesota. We used "my bag" in Kansas in the 70's and 80's. I am 44 and my wife is 33. She claims it was never my bag but she is wrong. The origin of this phrase actually comes from the card game "Spades". The game consists of 2 teams of 2 and each player has to predict how many hands he can take. After the round the player that predicted wrong often say to his partner my bag meaning my fault or my mistake. Young people heard their parents using "My bag" at the card table and took it to the basketball court. Spades is thought to have originated in the Midwestern United States (perhaps Cincinnati, Ohio) in the late 1930s. It was said to have been invented by college students who enjoyed both Whist and Bridge. They were looking for a fast-paced game that was competitive and strategic. The game slowly spread to other college campuses in the mid-west. The game really took off during WWII. After the war it spread to factory break-rooms and company office lunchrooms all across the country. Today there are clubs and tournaments and it's popular on the internet.
Didn't you get an invitation? Oh, my bad.
by rawmilkmike January 08, 2015
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A grammatically incorrect way of acknowledging (facetiously) a wrongdoing.
Used very commonly by gangsta-wannabes and other sorts of conforming posers, the terrible grammar tends to drive literate people up the wall in absolute irritation.
"Jared! Did you drop the baby?"
"Oh. Ha. My bad!"
"WHAT THE F?!?!"
by FranzMerlin January 21, 2006
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A term currently used when a mistake is made on your part. Allegedly originating from an unamed African Basketball Player in the 1980's (who spoke very poor english)who said it after missing a free throw. Several Sportscasters heard the phrase and used it as a joke until it became a part of popular culture.
by JorSi November 27, 2007
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