Green’s Dictionary of Slang

spikes n.1

[ety. unknown]

(US black) a dollar; in pl., used generically for money.

[US]A. Bontemps God Sends Sun. 99: ‘You is got enough money to ask for de moon. They tells me you got mo’ spikes than Carter is got oats, Lil Augie.’ ‘An’ I’m fixin’ to spend ’em all on you.’.