"My Bag" is the original form of today's "My Bad." They both mean “my mistake, my fault, my apologies." I'm writing this in
2023. I think "my bad" is still being used. Who knows how
long it will be
popular. The term “my bad” is a 1980s mispronunciation of the term "my bag" circa 1930 to 1995.
“My bag” was a term used when playing a
game of spades. In the
game, you would have to for-tell how many "books" or hands you would take. If you went over that number, it was called a "bag." If you were playing with a partner, it was a courtesy to claim your mistake by saying,"My Bag."
Spades originated in the Midwestern United States 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, but it didn't really take off until WWII brought so much of
America's youth into the military. Because the
game was portable, it could be played by small groups and could often be played in less than twenty minutes, its popularity mushroomed. You can still find the
game online.
“My Bag” meaning “My Mistake” should not be confused with “Not My Bag," meaning “Not My Thing” or “What's Your Bag?” Meaning “What's Your Problem?”
When I was in Catholic
school in the 70s, the term “my bag” was very common. Even though “my bad” is said to have come out in the 80s, I had never heard it until sometime around 2008 or so.