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Phrase used after someone says something ridiculous. What they said was so stupid and not right, it was a left. After you state the phrase, "that's a left." you swipe their neck for being so dumb.
John: mountain dew is gross.
Jake: come here.
*John walks over*
John: what?
Jake: that's a left.
*Jake swipes John's neck*
John: fuck you.
by reppinOREGON September 09, 2011
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