Sounds very french-like in origin. Do all in Switzerland use that though? Even the exclusively german-speaking part? In Austria there is a West-East difference, some words spoken by the Vorarlbergers (most western part) we don't too easily understand in the east (it's quite similar to swiss-german in some ways in the western area, but not identical either).

Yes, the GP was referring about Swiss German. Not sure if it's used in all the dialects, but at least Züritüütsch uses it.

But you're right it's most likely a much more recent import from French, just like "velo", "merci" and others.