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1.
The class of obnoxious co-worker who "shops" for lunch from those stored in the refrigerator by other co-workers.
#1: I brought a Lean Cuisine for lunch today, but some fridgetarian stole it.

#2: In attempt to suss out the office fridgetarian, Ben laced the slice of chocolate cake he stashed in the fridge with ExLax.
by EverydayDork February 12, 2010
 
2.
Someone who will eat anything in the fridge
Roomie 1: hey, did you eat my quinoa-radish-tofu salad?
Roomie 2: yeah, I'm turning fridgetarian.
by A_cunning_linguist April 25, 2013