The sex move is just a normal cream pie but you’re wearing a Red Sox jersey, holding a cup of iced dunks and you have to yell out “wicked smaht” upon climax. The dunks is optional. You can switch it out with a Sam Adams.
Patrick: Hey Sean! Gave my old lady a wicked Boston Creampie the otha' day!
Sean: You guys went to Faneuil Hall?
Patrick: Nah.
The act of having sex useing hersheys chocolate syrup as a lubricant then cumming inside the vagina and having her friend/yourself eat whats dripping out.
A Boston Cream Pie is the action you do while you creampie a woman. And what you do is insult her with a irish/Boston accent and then poor a small bag of coins on her.
"You like that you fookin gobshite?!?"
*poor's coins*