Slack and Slackers, definitions

To slack:
1. to make loose, or less tense or taut, as a rope; loosen.
2. to become less tense or taut, as a rope; to ease off.

Ambition:
1. an earnest desire for some type of achievement or distinction, as power, honor, fame, or wealth, and the willingness to strive for its attainment.

A slacker:
1. a person without ambition.
2. a person who gives up the idea of ambition in order to become less tense or taut, and to make the world less tense.

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From Return of the Slacker