A side dish you order (usually at a bar) to distract your moocher friends, thus leaving you free to enjoy your main meal without having to fend off drunk and hungry freeloaders that didn't order any food of their own.
(To the waitress...) I'll have a burger with everything. Oh and a side of decoy fries please to distract my broke-ass friends here who aren't going to order anything more from you except another 99 cent PBR.
The fries that have fallen out of the pouch and into the bag on your to go order, that you do not find until after you eat the rest of your food, then when you want more, you have a few fries left and they taste oddly sweet.