slacker (n.)youdaoicibaDictYouDict[slacker 词源字典]
popularized 1994, but the meaning "person who shirks work" dates to 1897; agent noun from slack (v.). In early use also slackster (1901). Compare Old English sleacornes "laziness," which is not, however, an agent noun. Related: Slackerly; slackerish.[slacker etymology, slacker origin, 英语词源]