An organism that eats both plants and animals ravenously
Some people are carnivores, I'm a omnomnivore.
A person or animal (a consumer, in the ecological sense) which oms and noms. An omnomnivore can be an omnivore, a carnivore, or an herbivore, as long as it oms and/or noms.
"Are you hungry?"
"Of course I'm hungry. I'm an omnomnivore."
"om nom nom nom nom"