Put in my work and punch the clock like Riddick Bowe's hands
from Lupe Fiasco (Ft. Travis Barker) – Joaquin Phoenix Lyrics on Rap Genius
Meaning
Employees at stores “punch the clock” so that the higher up people can keep track of how early people come into work and how late they leave.
Riddick Bowe was a champion boxer, so to punch the clock with Riddick’s hands would really rock the clock, and leave quite an impression. Therefore, this probably means that the amount of time Lupe spends working is shocking.

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