what does eminem mean in bad guy when he says "Eminem killed by M and M, Matthew Mitchell"
Matthew is Stan’s brother, a character from the song “Stan”.
If you didn’t wanna talk to me outside the concert You didn’t have to, but you coulda signed an autograph for Matthew That’s my little brother man, he’s only six years old We waited in the blistering cold for you for four hours and you just said no
He’s basically saying his past is catching up with him, and “Matthew” is a symbol of the past that Eminem can’t escape. The idea that a character from one his most popular songs is killing the present-day Eminem is symbolic of how his new music if always going to be compared to his first albums.