Smooch is a special move taught to Mario in the game Paper Mario.
After Misstar is freed from the Lava Piranha, she upgrades Mario's Star Power gauge and teaches him a new move called Smooch. When Mario uses Smooch in battle, Misstar will give him a sweet kiss that restores twenty HP. A very useful but expensive move, as it requires three SP to use, making it the most pricey move of its kind in the game.