When someone is getting really aggravated at you over something either big or small you could tell them not to eat you. Can be used in the same context as saying dont have a heart attack but instead tell them "Dont eat me". Or if someone is getting really mad at someone that you know you could tell them not to eat the person.
Also is best used with a "calm down" preceding it.
such as calm down dont eat me
Jomar: Why are we here? I hate this place!
Jacob: Calm down, dont eat me!
Jomar: What the fuck are you doing?!?!?
Jacob: OMG dont eat me...