"My bad" - commonly used when people are really trying to say, "Sorry, that was my mistake/my fault".
She mentioned to him that he had to choose a girl and this kid replied "Oh, my bad". Hilarious to me in that the class was a kindergarten class and the kid was all of 5 years old!!
Barbershopman
It goes to show how language gets passed down generations and copied from peers/parents/siblings.
The question I often ask is 'Who was the first to say that?!'... Did it come from a famous sitcom like 'Friends' or 'Family Guy'? Or did someone mega cool just happen to say it once and then it went linguistically viral?
I'll add another one to the mix...
"Every which way"... meaning, I think, 'in all ways possible at the same time' / 'in any of the many ways possible'.
Eg in tennis.... "Federer is serving every which way and his opponent can't get a read on it" (He's basically serving all over the place so the opponent can't guess what's coming next).
It obviously makes no sense.... I suppose it's an attempt to describe the meaning of the phrase by demonstrating the meaning within the phrase itself. What's the word for that?? Autological? Not sure. Either way, it's bad.