One who pretends to be
vegetarian, but is in fact not; A fake
vegetarian; One who claims to adhere to the
vegetarian ethos when in certain company, but consumes animal products and meat otherwise.
Jose: I saw Lauren at Fuji
Mountain last
night-- but she was eating chicken teriyaki. Isn't she
vegetarian?
Christie: That's what she tells everyone, but she's a total faketarian.