a container that holds french fries, onion rings, or any other side order formed so it can fit in a cup holder. Thus being able to be seated next to the almighty soft drink.
Sarah: Awww! I spilled my french fries all over the inside of my car. They wouldn't fit in the cup holder because of their inferior-to-the-soft-drink-cup shape so i placed them on the dash board!
Bree: Don't worry! You can have my fries. They're in a cup-panion!
Sarah: HELL YEA!! Now the soft drink and side order can coincide in peace!!