willy (1)youdaoicibaDictYouDict[willy 词源字典]
"A penis", Early 20th century: pet form of the given name William.[willy etymology, willy origin, 英语词源]
willy (2)youdaoicibaDictYouDict
"A sudden outburst of anger or annoyance", 1930s: perhaps from willy-willy.