Brewster’s, n. — Green’s Dictionary of Slang

Brewster’s n.

[the film Brewster’s Millions (orig. 1914, most recent version 1985)]

a large amount of money.

2001		K. Sampson Outlaws (ms.) 46: We’ve ordered a horse-drawn carriage, all decked out in white orchids and that [...] Costing us Brewster’s, by the way.
2013		K. Sampson Killing Pool 184: Talking brewsters here, stacks and stacks of cellophane-wrapped bunce.