Chocobo refers to the recurring bird species in the series. [view·edit·purge]The name "chocobo" derives from a Japanese brand of chocolate malt ball by Morinaga, ChocoBall(チョコボール, Chokobōru?). The mascot for this product is Kyoro-chan (キョロちゃん?), a bird who says "kweh".
食う / くう / kuu is a rough way to say "eat", whose volitional casual form is 食え / くえ / kue ("let's scoff 'em down!"), leading to Kweh!