Bon Appétit is the French for 'Enjoy your meal'. It was also used in many other places such as the name of a magazine. But if you heard this or someone wrote it in an email or a letter, just know that it means enjoy your meal.
P.S. the following example is a real life quote that made me find and add this word in the dicionary:
Student:thanks for the meal today, believe it or not, today I
didnt have anything for breakfast and not much for dinner the night
before, so that muffins were quite satisfying. :)
And I never thought of a strawberry that deep in my entire life.

Teacher: No doubt there'll probably be other unexpected things this quarter, but
I don't know how many of them will be food oriented. "Bon Appetit" regardless.
by randomguy908727 October 17, 2007
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French. Wishing ye a worthy apitite.
Mum: Dinner is prepared you boys and I've spent all day getting it ready.
(the two boys sit at the table with the cutlery in hand salivating while mum finishes serving dinner)
Mum: bon appetit
by William Tristan Turner December 2, 2006
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When you sit at the table after you got your school lunch in the cafeteria.
*you and your friends walk to your table in the cafeteria and sit down*

Person 1:" bon appetit"

Person 2: "bitch"

Bon appetit bitch
by Scrumptious. April 11, 2019
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my girlfriend is so roman attic! i come inside from outside to this everyday! Boney African feet! (Bon Appetite)
by ChIcKeN nUgGeTz In A hOt TuB September 7, 2020
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