Vegemite bland bitch 

Anyone, (boy or girl) who is solely self defined by being a vegetarian - so much so that they cannot talk about anything else but what they cannot eat. Usually annoying to the rest of the group, the vegemite bland bitch will bring the pot luck party down hard and fast with pastey bean curd contributions. Avoidance is completely necessary in order to be able to talk about other things besides how horrible everyone else is to their bodies.

Oh shit, Karen is coming to the party on Friday.
She's a total vegemite bland bitch

Vegemite bland bitch by DW's July 11, 2016