I have heard the following dialogue in the movie "Le Fabuleux Destin d'Amélie Poulain":
- Aux frais de Monsieur Collignon.
- De ? Monsieur Collignon. Lucien !
- J'ai pas fait attention, Monsieur Dufayel.
- Exercice, mon petit Lucien. Répetez après moi. Collignon, crêpe chignon.
Context: Lucien and M. Dufayel are talking about food products which the young man Lucien is delivering to M. Dufayel. Lucien disguised some expensive products as cheap products in the delivery box so that his boss, M. Collignon, would not notice it. Now, Lucien is showing the products to M. Dufayel. Although I don't hear it, I think that Lucien pronounces the GN in "Collignon" incorrectly in the first line. Then, Dufayel helps him to get the pronunciation right with a rhyme. What does "crêpe chignon" mean? I know that "chignon" means "hair bun", but I have no idea what it means in the context of a crepe.