It is confirmed from reliable sources that the official word for French kissing is galocher—the sucking sound galoshes make when you walk in the rain—likewise tongue kissing sounds.
The French kiss has its history squarely ensconced in the Second World War. Soldiers coming from Europe had learned this sensual new method of making out—that is with the tongue. Galoshes of course are overshoes or covers for shoes and the French word for that is galoches. The verb galocher is now the official replacement for the rather longish embrasser avec la langue. Even English dictionaries are accepting galocher for French kissing. This has been made possible by the 2013 entry in Le Petit Robert which is actually the 2014 edition of the popular French dictionary and will be soon available in book shops and of course online.