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."
"What?"
"om nom nom nom nom"
Brittany was ravenous. She wolfed down the salad, then the appetizers, then the entrees, then the dessert, then the horses in the barn, and, finally, the cows in the meadow. She sure was a gold star omnomnomavore.
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.
FRIEND A: "Did you just take a stealthie of me?"
FRIEND B (turning phone around): "no I was just using snapchat's new filter, see?"