Ha! I got some skeletons in my closet
And I don't know if no one knows it

from Eminem – Cleanin' Out My Closet Lyrics on Rap Genius

Meaning

Em we know you have skeletons in your closet. In fact, we know you have them under your bed and up under your faucet as well!

Skeletons in your closet means you have dark, hidden secrets.

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