Bon appétit definition : (I wish you) a hearty appetite.. See examples of BON APPÉTIT used in a sentence. You’ve probably heard the French expression “ Bon Appétit” many times in movies and conversation… but what does it actually mean , and how do you pronounce it correctly? Find out once and for all... BON APPÉTIT meaning : 1. a phrase, originally from French, meaning "good appetite", said to someone who is about to eat…. Learn more. Usage notes: Rumors of its demise have been greatly exaggerated: the French expression bon appétit is everywhere. Regardless of whether you’ll be eating together and even when there’s no food in sight, in big cities and small villages and at the park and on the plane, any time you talk to someone around mealtime, it’s polite to say bon appétit or, informally, bon app.