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Clueless, inattentive or careless.

After he drove with his turn signal on for five miles, I was pretty sure he was out to lunch.

Additional definitions for 'out to lunch':

out to lunchAway eating lunch or for a midday break; especially, away from work or a job.
out to lunchIs mindless; isn't paying any attention.
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"out to lunch." Phrases.net. STANDS4 LLC, 2017. Web. 19 Nov. 2017. <http://www.phrases.net/phrase/out-to-lunch_5955>.

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