I've been counting dirty money since 12:30
A-M, weigh them, if they short take them
Right back and spray him amen, yea

from Lil Wayne – Let The Beat Build Lyrics on Rap Genius

Meaning

Weezy weighs the money in order to see if its all there. If the money is short, Wayne will go right back and spray his dealer. An easy was to weight large amounts of illegitimate money is to weigh it.

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