noun
a gift exchange tradition where participants are randomly assigned a person to whom they give a gift anonymously
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The office decided to organize a Secret Santa gift exchange for the upcoming holiday season.
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We're doing a Secret Santa at the party this weekend, so make sure to bring a fun gift!
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I heard we're doing a Secret Santa thing at the office - should be interesting!
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In a way, life is like a never-ending game of Secret Santa, always surprising us with unexpected gifts.