What is the X in X-mas?
Spanish cojon 'testicle'
"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 (see cell). In English, first attested in Hemingway.
Courage; audacity; balls: requiring cojones the size of the award-winning cabbages at the state fair/ You've got stainless steel cojones, Dave
[1932+; fr Spanish ''testicles'']