A person with contemptible snacking behavior, usually a couch potato. Used as a derogatory insult much like you would use "douche bag".
Did you see Kaeli? She is such a snack bag!
Sometime that happens or something you find that pleases you but it totally unexpected.
Wow I'm thirsty and I just found a dollar in my pocket,what a snack-in-the-bag.
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When you sneak into the office fridge and fart in your co-workers bag of snacks that's in their lunch bag and then close it back up.
"Aw shit! Tommy, did you dutch snack bag my chips?!?!"