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 pomlázka (in Czech) or korbáč (in Slovak), in eastern regions of former Czechoslovakia Moravia and Slovakia they also throw cold water on them. The pomlázka/korbáč 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 may be painful, but it’s not intended to cause suffering. A legend says that women should be spanked with a whip in order to keep their health, beauty and fertility during the whole next year.
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 (kraslica) prepared by themselves, invites to eat and drink as a sign of her thanks to the man. If the visitor is a small boy, he is usually provided with sweets, and a small amount of money.
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.
Wikipedia