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A vegan who finds an excuse for eating oysters by claiming oysters belong in the plant kingdom instead of the animal kingdom. Ostrovegans do not eat any meat or animal byproduct like milk, cheese, honey, etc. except for when it comes to oysters based on the idea that oysters probably do not feel pain.
Guy: These bivalves look delicious.

Girl: I thought you were vegan?

Guy: No worries, oysters are basically plants. I'm ostrovegan.
by lilspiker January 01, 2017
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2
A person who is otherwise vegan, but is ok with consuming some bivalves (oysters, muscles, clams) under certain conditions.
Jaylen's an ostrovegan, so he'll happily eat oysters.
by Sierra Thoreau December 28, 2017
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