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?
Wayne: Yeah?
Bill: Well I picked her up after you left.
Wayne: Dick move santa