Saperlipopette bis

Saperlipopette, j'ai oublié la prononciation! (oh my, I forgot the pronunciation). If you really want to use yesterday's word, it's pronounced sah-pair-lee-poh-pet

And also, don't forget this Sunday is l'Epiphanie, if you can get your hands on one, have a Galette des Rois

Saperlipopette

A mild interjection ("oh my") that has apparently slowly derived from variations of sacrelote / sacrebleu / sacredieu, all blasphemous at some point (sacré = sacred, Dieu = God)

Today it is a pretty insignificant, almost antiquated thing to say though, but you can always try it.