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(Generally: to finish someone's sandwiches). To interrupt a person, assuming incorrectly that you know what he or she is going to say. Inspired by an exchange from Arrested Development:

Michael: It's like we finish each other's...
Lindsay: Sandwiches?
Michael: Sentences. Why would I say...
Lindsay: Sandwiches?
Person A: "I think I'd like..."
Person B: "Ice cream?"
Person A: "To go home. Stop finishing my sandwiches."
by yawnoc August 10, 2013
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