My hammer sing murda music, I'll let you listen to death
Possibly a reference to Krayzie Bone’s song titled Murder Music. The song is very violent and describes mass murdering.
Meek could be saying two things.
1)He is saying that his gun works the way the song does. It sings murder music, and he intends to let you hear the gunshots.
2) He could also be using a common expression such as “eat your heart out,” essentially saying listen to your heart’s content.
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