The Abomination(1988)

Tumorous parasitic beasts are nesting in the bowels of their victims...

A mother obsessed with mind-altering televangelism consequently vomits a pulsating growth that slithers down the throat of her son during the night. Upon spewing the parasite, the son is driven by an uncontrollable force to murder and feed corpses to the now-multiple-toothed monsters manifesting throughout the house.