The act of prohibition of alcohol during the month of December in support of finals, exams and assignment. Unlike Octsober however, Drycember only last's up till December 23rd, after which follows 3 weeks of binge drinking and possibly narcotic addictions.
Commonly observed by Asians.
Also see Octsober.
"Chan! two slutty elves just texted and told us to go to their party!"
"STFU guai lo, i practice Drycember, talk to me after the 23rd!"