A few years ago when the saying "My Bad" became popular, I'd heard it referenced in movies and from the kids for some time. After hearing it for a while, I was able to determine that it meant something along the lines of "Ooops, I'm sorry" or "Sorry that was my fault". I've never been one to practice using the latest hip lingo or slang terminology and this will give you a good idea as to why.
One day I threw a kitchen towel or something at my husband but it was a bad throw and ended up hitting him in the face. With it having been an accident I wanted to acknowledge my error and bad throw so I said, "Sorry, my bag." He looked at me real funny and as soon as he said, "What did you just say?", and I saw that smirk on his face, I knew immediately that I'd just totally screwed up. He asked me again what I'd just said. I very reluctantly answered, "My bag", as if in more of a question form and almost apologetic. He started laughing hysterically and informed that it was actually "My bad" and made fun of me for days to come.
As I've said before, you have to be able to laugh at yourself and a good laugh is almost always worthy of sharing with at least someone. The one and only person I chose to tell this story to was my sister and she was sworn to secrecy. We had a good laugh at my expense and I thought that would be the end of it.
Months passed and I'd all but forgotten about my little slip of the tongue until one day when my sister's middle son decided to mock me. They were at my house when he slipped up by saying, "Oh, my bag" to me. I turned around with my mouth wide open. My sister had that “deer caught in the headlights stare” knowing she'd just been busted for telling anyone my embarrassing story. She tried defending herself and claimed she couldn't pass it up, that it was just too funny. Making it worse, she'd told all three of her boys and her husband and my kids were now asking for the details.
It became the norm for all of the kids to harass me about it at any and every possible opportunity. Every time I turned around I was hearing one of them say, "My bag". It died down some over the years, but every time I think they've finally forgotten it, one of them still goes there. (Even as recently as Christmas Eve!)
Up until last summer it had remained a joke only between my kids and three nephews, but that all changed during our annual camping trip. We go with a large group of people every year and there are easily thirty kids within our group. Apparently, one of my precious, beloved nephews decided to share the "My bag" story with all of the other teenagers during the trip and my little secret was out. I couldn't walk past a kid without hearing "My bag" during the entire trip. I tried the ignoring method but it just wasn't effective.
I'm sure the eulogy at my funeral will go something like this: "Well, she might've been our crazy aunt, but we'll always remember her fondly for that old saying "My bag". Now I stick with phrases that are more my style.