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
Get the Boston Creampiemug. 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
Get the Boston Creampiemug. Tommy stuffed my pink harbah full of clam chowdah last night. He gave me the warmest Boston creampie evah.
by Userjaymes June 3, 2019
Get the Boston Creampiemug. 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
Get the Boston Creampiemug.