Mais Pourquoi On Dit Ça?

Do you ever say something in your own language and wonder where it comes from? Here are a few French phrases that are frequently used but have no clear origins:

1) Un petit chouia - comes from the arab language 'chouya' and it means 'a little'.

eg: 'Tu veux du gateau?' 'Oui, mais juste un petit chouia, s'il te plait.'

2) A pétaouchnok - invented in the 1940ies to imitate the name of a russian town far far away. It simply means 'far away' or 'in the middle of nowhere'

eg: 'Il habite à Pétaouchnok.'

3) A la Saint Glinglin - Glinglin is a fictional French saint but the exact origin is unknown. It means 'some day in the indefinite future or never'

eg: 'Je ferai un marathon à la Saint Glinglin.' (hmm, jamais!)