The basic idea behind Pie in the Face is that at the end of the scene, after the girl gets a cream pie of jizz shot into her ass, she squeezes it back out into the dude's hand and he smears the "pie" on her face. It's definitely an interesting bit of nastiness in a biz that has pretty much already seen it all.
Overall, the sex is very vigorous, and the camera lens gets spit on a lot. Candy Sweet hums the "Happy Birthday" song while Seth Dickens fucks her mouth. Mickey Ray yanks Alexis Duval by her hair and aggressively fucks her mouth. But Roxanne Hall's blowjob shuts down everybody. She makes a total mess.