I slowly started moving them out the closet to this mic booth

from Joe Budden (Ft. Crooked I, Joell Ortiz & Kaydence) – Skeletons Lyrics on Rap Genius

Meaning

He took his skeletons from his closet and brought ‘em to the mic booth.

Meaning that he took his insecurities, issues, problems, etc. and let everything out on his rap songs.

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