I'm the siren that you hear, I'm the butt police
And I'm looking at your rear, rear, rear
Eminem being classy as always!
As an onomatopoeia
The way he pronounces it mimics the sound of a siren (the one on his…butt police patrol car). It could also be a throwback to his previous feature on a pop star’s song — Here Comes The Weekend.
Just like his old Chainsaw “run run” lines, he uses the very rare technique of onomatopoeia wordplay.
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