Get key money from a quarter, blame it on my wrist

from Lil Wayne – Money on My Mind Lyrics on Rap Genius

Meaning

I get “key money” (the amount of money one would normally make selling a kilogram of coke) “from a quarter” (from selling a quarter of a kilogram of coke)

How? Blame it on my wrist. i.e., it’s because I cut the cocaine so well (a wrist-heavy activity)

On “Make It Work For You” by Juelz Santana, both he and Young Jeezy discuss their wrist skills (Wayne is also featured on this track):

[Jeezy]
Fuck a magic stick Jeezy got a magic wrist
David Copperfield on the stove all types of shit

[Juelz]
I can show you how to mix that shit
How to whip that shit, how to twist that wrist

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