noun
a game in which players use a mallet to hit toy moles that pop up randomly from holes
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The children were entertained by playing a game of whack-a-mole at the carnival.
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Let's go play some whack-a-mole at the arcade!
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I totally dominated at whack-a-mole, I'm a pro!
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Dealing with all these unexpected problems is like playing a game of whack-a-mole.