Its Christmas eve and you dress up in a Santa outfit. You climb on the top of a house and scream Santa's here, and when someone looks up through their chimney, you ejaculate down the chimney as if it is a present.
John: Where were you last night on christmas eve??
You: I was performing the Santa..
Dick move is an action in wich you were or have been "a dick" to another individual. Dick move santa refers to the receiving of cloths or other items not deemed acceptable by a child. Presumably from Santa who was at the time being "a dick".
Bill: Hey bro you know that girl you were trying to hook up with at the club?
When Santa is too fat for your chimney and he gets stuck so you pull out his tiny dick and start jerking him off all night.
Kim: Santa's stuck in my chimney!
Santa: help!
Kim: *pulls down santas pants*
Santa: wha- what are you doing?
Kim: oh nothing, just milking the Santa!
Santa: oh god!