A coma week is a week in which the participant will spend the entire time drunk - going out every night of the week, getting drunk, returning home, sleeping and then eating a fry up and starting drinking again in preparation for the next night of drunkenness.

It is so named because after 7 days of near-constant drinking, the participant will be in a state that resembles a coma - unconscious and unresponsive to stimuli
Steve and Dean decided to celebrate their graduation by doing a coma week.
by SellyOakRam March 21, 2010
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