sissy (n.)youdaoicibaDictYouDict[sissy 词源字典]
1846, "sister," extended form of sis (q.v.). Meaning "effeminate man" is recorded from 1887; the adjective in this sense is from 1891. Related: Sissiness. Sissy bar is recorded from 1969.[sissy etymology, sissy origin, 英语词源]