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12.
A way of appologizing when you don't reallly care about the situation. Kind of like saying whatever.
Teacher: Joe, stop texting
Joe: My bad
de a keyboard 12 décembre 2009
 
1.
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."
de Lita 17 août 2004
 
2.
(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."

"#@%$!"
de Traffic-Cone-Liberation-Force 16 novembre 2004
 
3.
I'm sorry I didn't know.
My Bad I didn't see you there.
My Bad Bra, I didn't know you that well.
Why, didn't you talk? My Bad, Girl Baby!
de Mr. be safe always 15 juin 2014
 
4.
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?!?!"
de FranzMerlin 21 janvier 2006
 
5.
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.
I just sat on your mom, my bad,
de JorSi 27 novembre 2007
 
6.
A term used to tell someone that you made a mistake and apologize at the same time. Originally Used Mostly by African Americans but over the years it has become a more mainstream term; so it is not uncommon any more to hear anyone else (possibly in the professional world too) say it to admit to making a mistake.
Teacher: The answer to #1 is B (then he show his work)
Student: Sir I believe you are wrong. (student explains their answer)
Teacher: My Bad you were right and I was wrong, sorry for the misunderstanding
de Yourname2 2 avril 2007
 
7.
Incredibly annoying phrase which people use when they do something stupid or wrong
Kim: You just pulled my ex boyfriend
Lucie: My bad
de Kathryn who is luvin my baby Az 7 novembre 2005