Originally a black slang (or African American slang) to mean good. Other forms are badder and baddest. If the speaker doesn't know what this slang term means, they will think it's hard to analyse or understand since this slang comes from the acronym. Due to the evolvement or the language, this term is widely used especially in American English.
The game is so bad! In this sentence, it means that something is really good.
If you write "This game is the worst", it has a negative connotation.
If you write "This game is the baddest", it means that the game "is" good and it has a positive connotation.