Small talk about the Reptilian

The boy and the girl spend time at a motel run by the boy's mother. Then suddenly, the boy's penis gets stuck to the girl. The boy struggles to get his penis back, but the girl speaks in cryptic terms while eating the boy's body parts one by one as pizza toppings. They fight by snatching the pizza from each other, stabbing, and screaming. In the end, the boy is devoured by the girl.