Noun

1. One who procrastinates or is lazy; cf. slack off.
2. A person lacking a sense of direction in life; an underachiever.
3. A user of Slackware Linux.
   • 1996 August 15, stephen benson, "Re: How broken is Infomagic's Redhat linux?", comp.os.linux.setup, Usenet,

     I'm a slacker from way back btw

   • 2002 January 15, Josh, "Re: slackware installation issue", comp.os.linux, Usenet,

     Hope you become a happy slacker.

   • 2007 May 16, Dan C, "Re: Distro Poll, what do you use?", alt.os.linux, Usenet,

     Any real Slacker would know better than to top-post, AND post a bunch of HTML-crap to boot. You're not worthy.