"Mustn't Masturbate Merry Christmas" is a challenge given to mostly men that revolves around that masturbating for all of Christmas Eve and Christmas day. Those who fail are forced to become elves, working in
Santa's workshop for the rest of their lives. Those who pass, however, are given 30 minutes to do what they'd like with
Mrs Claus, Santa's wife. Most, however, tend
to pork her.
Example:
Person 1: Why have you been
so down recently?
Person 2: I don't know.
I just can't find the holiday spirit.
Person 1: Just participate in "Mustn't Masturbate Merry Christmas"!
Person 2: What's that?
Person 1: *shows them
Urban Dictionary definition*
Person 2: Don't ever talk to me again.
Person 1: *commits suicide*