A person who is otherwise vegan, but is ok with consuming some bivalves (oysters, muscles, clams) under certain conditions.

Intelligence agency term for "psychological operation". A government or corporate-sponsored operation, usually taking the form of a "terrorist attack" or "crazed gunman on a spree", with the intent of panicking the public into demanding more police and laws inhibiting freedom. Psyops are usually carried out by drugging a civilian or group of civilians with aggression-promoting drugs, psyching them up, arming them, and sending them out to commit mayhem. Government-sponsored terrorism. See also blackshirts, conspiracy

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.

A person who seeks the cachet of being vegan by misappropriating the term, but doesn't adhere to vegan principles and practices. A contradiction in terms, such as: a self-described celibate who sleeps only with blondes; a pacifist who kills only insert member of oppressed group; a virgin who's had sex only 10 times; or a Catholic who doesn't believe in the holy trinity, the resurrection, the virgin birth, communion, confession, papal decrees, the authority of the Pope, Jesus, or going to church.