a boston cream pie is when the male takes his penis and enters the rectal area from behind so there is a lot of "poo poo" on the penis and then he makes the female suck on his penis so he ejaculates thus having a brown (chocolate) penis with seamen spewing out which is the cream.
jon gave lindsey and boston cream pie which was amazing becuase she loved it when his poo penis spluged in her face.
The act of ejaculating in a particularly dark anus, generally stained with crusted feces. While the anal color may vary, the act is most often associated with a deep chocolate colored butthole.
The sexual act of a large group of men ejaculating in a women's mouth then when everybody's finished in her she spits it out all over a chocolate fudge vanilla cake and serves it up to a dog and then legend has it the dog gets sick and throws up all of the semen all over her chest and then she attempts to shove as much throw up in her pussy as possible through a injecting device then spit it back out of her pussy again onto the dog. It's usually common to find the men wearing David Ortiz Red Sox jerseys and listening to the Dropkick Murphys while they are unloading in the women's mouth just to make it more Bostonish.