Someone is bivegsual when they claim to be a vegetarian but they still eat both meat and veg.
E.g.

Person1: "Hi I'm a vegetarian!"
Person2: "So why are you eating a BLT?"
Person1: "Oh, because bacon tastes great!"
Person2: "So, you're actually bivegsual."
by SotonVeggieSupreme October 17, 2013
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