Knock his top to his bottom jack

from Lil Wayne – BM J.R. Lyrics on Rap Genius

Meaning
  1. In rap putting your “head beneath ya feet” is saying your dead. “Knock his top to his bottom” — He’ll fuck you up… to death.

  2. “Jack” may refer to Jack and Jill, and how they rolled down the hill, Wayne popped one off, and knocked his top, to his bottom where the blood did spill.

(Not actual lyrics to Jack and Jill)

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