A man or women who is considered a snack or not the main meal.
Or
A man or women that is being used for pleasure or sport ( money, s**, etc.).
Friend: “Girl, I thought you and James were together.”
Man Eater: “ Girl nah he got good s** , but make 20k a year that n**** a munch. I’m seeing Dj tomorrow.”
This is a person who is just a one night stand or a person used just for sex.
The girl I met last night was just a quick munch.