ygritte

This is what Wiki says about the traditions, for those who are curious:
In the Czech Republic and Slovakia, a tradition of spanking or whipping is carried out on Easter Monday. In the morning, men spank women with a special handmade whip called a pomlzka (in Czech) or korb (in Slovak), or, in eastern Moravia and Slovakia, throw cold water on them. The pomlzka/korb consists of eight, twelve or even twenty-four withies (willow rods), is usually from half a meter to two meters long and decorated with coloured ribbons at the end. The spanking is not painful or intended to cause suffering. A legend says that women should be spanked with a whip in order to keep their health and beauty during the whole next year.[2]
An additional purpose can be for men to exhibit their attraction to women; unvisited women can even feel offended. Traditionally, the spanked woman gives a coloured egg and sometimes a small amount of money to the man as a sign of her thanks. In some regions, the women can get revenge in the afternoon or the following day when they can pour a bucket of cold water on any man. The habit slightly varies across Slovakia and the Czech Republic. A similar tradition existed in Poland (where it is called Dyngus Day), but it is now little more than an all-day water fight.