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.