The act of flatulence on mall Santa's lap right after he asks you what you have wished for Christmas. Psychological distress and trauma is considered a likely aftermath effect for the receiving persona. The effect is further enhanced by the act of defalcation which is smoothly triggered as an aftermath of successful flatulence.
Graham Smith: Look mom, it's Santa. can I go sit on his lap?
Mama Smith: Yes son, go and show that Dirty Santa why you deserve a present.
.....
Santa: Sit on my cozy lap young man... Now... Tell Santa what you would like for Christmas.
Graham: (lets out a nice wet floppy stinker).
Santa: WTF bro, now my pants have a shit stain on them.
When you're in the backseat of your car and you don't want to bust on your backseat. You bust in the palm of your hand then slap her on the face. Causing a white beard on her face.
Joey was banging his Hinge date in the backseat of his cars as he was about to bust he realized he didn't want to stain his seats. He then made the decision to conduct a Dirty Santa on his Hinge date and his seats remained clean.