“Don’t get cute” literally means “don’t act cute,” but its actual meaning is completely different.
This expression is used to stop someone when they are taking the situation lightly or speaking in a playful or annoying way.
It is usually understood as meaning something like “don’t joke around,” “don’t try any tricks,” or “don’t be sneaky.”
Americans in particular often use it in arguments, negotiations, or everyday conversation when the other person seems to be trying to slip away cleverly or brush things off with a joke.

3 everyday conversation examples
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Don’t joke around and speak seriously. → Don’t get cute, just be serious.
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Don’t try to cleverly get out of it. → Don’t get cute, stop trying to wiggle out of it.”
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Stop joking and let’s get to the point. → Don’t get cute, let’s get to the point.”
3 academic/professional English examples
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Since the presentation time is limited, please focus on the key points rather than speaking around the issue in a playful way. → Time is limited, so don’t get cute—please focus on the key points.
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Don’t try to dodge around the question; answer it exactly as asked. → Don’t get cute with the answer—address the question directly.
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In academic discussion, evidence matters more than wit. Don’t let it drift into wordplay. → In academic discussion, evidence matters more than wit. Don’t get cute.