The act of a male ejaculating inside an anus. The receiver of the ejaculate will relax the anal walls allowing an undetermined amount of semen and fecal matter to leak out, thus creating the stinky cream pie.
Kenny: Hey bro that dude broke up with me.
Richard: What happened man, you two seemed so happy?
Kenny: I gave him a stinky cream pie and it ruined his expensive bed sheets.
Richard: Wow, I can't believe he didn't appreciatethe stinky cream pie, your mom loves them!
Also used as: put that in your pie crust and bake it; put it in your pie crust and bake it; stick it in your pie crust and bake it.
Quincy: Did you know that the bell pepper you're chowin' down on, like a bloody HOG, is one of the highest pesticide vegetables on the planet?
Javier: Oh really? Well, I purchased this one at Fred Friggin' Meyer, and every one knows that Freds purchases fruits and veggies with low levels of pesticides -- so stick that in your pie crust and bake it!