Short for slacker attitude, or the general demeanor of an person with a lackadaisical and ineffectual 'devil-may-care' approach to life as a whole, which may prevent the individual from realizing his full potential. See Richard Linklater.
The singer's slackitude was threatening the future of the band, as a consequence of his chronic propensity to skip practices and show up late for gigs, coupled with his general lack of motivation to write new songs and shoot videos.
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