Green’s Dictionary of Slang

pizaro n.

[? the Sp. conquistador Francisco Pizarro (c.1475–1541), who ‘discovered’ Peru and founded Lima]

(US) a fad, a discovery.

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[US]‘Hugh McHugh’ Out for the Coin 17: That’s the latest pizaro, my friend. All we millionaires begin to build tunnels when our wealth gets cumbersome.