cojones (n.) Look up cojones at Dictionary.com
"courage," literally "balls," 1932, from Spanish cojon "testicle," from Latin coleus, culleus (source of Italian coglione), literally "a leather sack," related to Greek koleos "sheath, scabbard," from PIE root *kel- (2) "to cover, conceal, save." In English, first attested in Hemingway.