Smithmas 

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

Smithmas by TheDoctorandI December 14, 2010

Will Smithmas 

An american holiday that takes place on the 4th of july when all the best will smith movies come out.

i have trouble sleeping the night before Will Smithmas.

Will Smithmas by cameltoe crusader July 4, 2009