Top definition
Someone who was/is born on Christmas day or within five days of Christmas. Relatives and friends have to decide whether to get them Christmas OR Birthday presents, but quite often end up getting neither. The word is a contraction from mediocre Christ, since the mediochrist is usually submerged and forgotten about by the Christmas hype.
Three days till Christmas and ive done all my shopping!

Dude, its Zanzibar's birthday tommorow.

Oh who cares about that mediochrist, lets just say we got caught up in the Christmas hype.
by BitchGotTheJitters December 23, 2009
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