Top Definition
Refers to December 25th, 2010 when all the Whovians will come together to celebrate Matt Smith's first Christmas on Doctor Who.
Person 1: I am so excited for Christmas

Person 2: But I thought you were Jewish

Person 3: Well I'm more excited about Smithmas
#doctor who #matt smith #christmas #christmas special #dw
by TheDoctorandI December 13, 2010
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