Yes, I lick off the time you gotta be there, (nine)

from Lupe Fiasco – Absolute Freestyle Lyrics on Rap Genius

Meaning

Connecting this with the previous line, 9:00 is presumably the time one has to be at work (for most jobs).

“Lick[ing] off” is (usually) slang for firing a gun and killing someone. When Lupe is “licking off the time”, he is taking another rap phrase (“killing time”) and intertwining the two sayings by simply saying that you need to listen to his words.

On top of that, with regard to killing time, a 9mm is a very popular gun people use in the hood.

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