Hi,
Wikipedia offers this information.at http://en.wikipedia.org/wiki/French_kiss
In French, it is simply embrasser avec la langue (literally to kiss with tongue). Nevertheless, in popular language this is referred as rouler une pelle (to roll the spade), emballer and some rude words like: "Galocher", "rouler un patin" (to roll the blade). In Quebec, people call it "Frencher".
Personally, I think embrasser avec la langue sounds like greet people using friendly language.
Clive