Where did the phrase "MY BAD" come from?

The phrase "my bad" is believed to have originated in basketball slang during the 1970s. It was commonly used by players to acknowledge their mistake or take responsibility for a mishap during a game. Over time, the phrase gained popularity and became more widely used in informal spoken English to admit fault or apologize for a blunder in various contexts beyond sports. It has since become a colloquial expression used casually to acknowledge one's own error or fault.