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?
After copulation, while a man is ejaculating on a level surface (such as a face or belly), the man rub his penis in his ejaculate and then drags the tip across the surface. This leaves a long semen trail that resembles the path of a slug.
"I dick slugged the Wendy from Applebees"
"You slapped her with your dick? Yo, thats sexual assault"
"No no no, I gave her a DICK SLUG..."
"Oh! Yeah she prolly liked that ish"
An action performed on someone so inconsolably stupid that you need to let them know the amount of their stupidity, in the most informal and direct way. Take a dick pic, print it, tape it to a brick, then whack the aforementioned stupid person upside the head.