Food bag

Somebody who binges on food - eats 'bags' of it.

"You've had twelve bags of crisps, sixteen chocolate bars and four hundred m&m's, don't you think you're turning into a bit of a food bag?''

Fast food bag dump off

When someone throws fast food bags out the window of their car because it is filled with them and they are too lazy to find a trash can.

Dude 1: "Dude I found a whole bunch of fast food bags in the bushes outside my house..."
Dude 2: "Oh yeah, that was me... every time I come over I eat some Cajuns and dump the bag in those bushes."
Dude 1: "You lazy ass! Can't believe you would do a fast food bag dump off by my house!"