Coo-Coo Chips are a fictional brand of chips that appeared in South Park: Bigger, Longer & Uncut.
Background
In South Park: Bigger, Longer & Uncut, Eric Cartman can be seen eating Coo-Coo chips while all the other children are singing "La Resistance".
Appearance
The bag is yellow; there is a picture of the chips themselves at the center of the bag as well as "Coo-Coo Chips" inscribed near the top of the bag.