In modern lingo, a vegetarian who occasionally eats meat

• Occasional meat eater
• One who usually avoids meat, but might sometimes be persuaded

Wiktionary Word definitions in Wiktionary
a. 1 (context of a person English) Being a #Noun. 2 (context of food, a diet, or the like English) Being what a flexitarian might eat. n. One who is usually or primarily vegetarian, but who is not strictly so.