Bonjour, mademoiselle! Vule vu kushe avek mua?
O revoir (emphasis on "a") is a French "goodbye", which is used without demand in almost all European languages, thanks to the beautiful sound. Well, not that very beautiful, but certainly more pleasant than "aufiederzeyn" or, b-the same upasi, "lehitraot".
In a literal translation from French into Russian, "au" means "before", and "revoir" means "seeing again". Concerning the merged or separate writing "about the revoir" in Russian there is no reinforced concrete rule, so if you are too lazy to reach the blank, write together.
About the rooster is in the list: French words