the act of ejaculating inside the vagina or anus while shouting "LET'S GO RED SOX" and slapping the penis 1-2-123 on whichever surface one ejaculated inside, as if you were at a baseball game
So I brought home this girl last night, and i found out she was a Yankees fan, so when i finished, i gave her a Boston Creampie.
by Sully Sullivan November 18, 2010
The Boston Creampie occurs when, seconds prior to ejaculation, one removes the phallus and ejaculates onto the abdomen of another. One must then urinate onto the abdomen and/or upper torso of said ejaculate catcher in the shape of the letter "B". This is only worthwhile if the receiver is a fan of the New York Yankees Baseball club.
That cumdumpster I fucked last night told me she is a Yankees fan, so I gave her the Boston Creampie to show her the error of her ways.
by Joseph Edward January 04, 2008
When you cum into a girls pussy while she is on her period, then she proceeds to rub her pussy on your face afterwards.
by Maker of Pies December 30, 2016
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.
Last night i made the best boston bedroom creampie, my girlfriends sister said it was the best she ever had
by Knarf Oressap January 23, 2018
I knew she was a true Red Sox fan when she asked for a Boston Creampie during the seventh inning stretch.
by abbycockbane January 17, 2023
The act of ejaculating inside a MIT undergraduate whilst saying "F**k You, Oh yeah" in a concentrated, pronounced Bostonian accent. Duration varies between six seconds to a full two minutes. In order to be accurate, one must wear one of the following while committing this act: A Celtics jersey, New England Patriots Jersey, or red socks. After ejaculation the partners must deposit the semen into a cup of New England clam chowder - only New England - and thereafter consume it with Irish beer.
Goodness fucking gracious do you smell that good-ass clam chowder? A couple must've gave each other a Boston Creampie!
by Lá Big Cheese June 20, 2017
When a woman takes a dump and doesn't wipe, and then her boyfriend fucks her and cums inside her unwiped, poop-covered asshole.
My girlfriend asked if we could do something different tonight, so I waited for her to take her nightly dump and I gave her a Boston Creampie
by Rusty Shillelagh November 21, 2016