I am the authentic language of suffering. My cold, gold eye
does not blink. Mister, you want nice time? No problem.
I say, Screw You. I buy and sell the world. I got
Midas touch, turn bread to hard cash. My million tills
sing through the night, my shining mad machines.
I stink and accumulate. Do you fancy me, lady? Really?
See me pass through the eye of a needle! Whoopee,
I cut Time dead with my sleek facelift. I travel
faster than $-sound. Don't give me away; after all, no one
can eat me. Honey, I'm a jealous God, $-stammering
my one commandment on the calculator. Love me.
Under your fingernails I smile up with my black grin.
Don't let my oily manner bother you, Sir, I'll get you
a taxi, get you a limousine. I know a place
where it's raining dollar bills. I got any currency
This repulsive line brings to mind a hand with sharp fingernails scratching and scrabbling for money and becoming dirty in the process. 
 The “black grin” has manic implications, continuing the  personification .  The idea is  Gothic  and sustains the tone of disgust. 
 This has connotations to sex as she is under the fingernails of the male. Fingernails suggest scratching which has sexual associations,  emphasising the notion of prostitution. The “black grin” suggests fake happiness during her sex work.
Money Talks