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1.
After purchasing and eating fast food, there are without fail chips/fries that have fallen out of their packet and into the bag, where they sit cold and alone until you have finished your takeaway.

These chips at the bottom of the paper bag that are left and only found at the very end of your meal are known as bonus chips.
"Result, I've still got bonus chips!"
by Lonely Cowboy February 27, 2012