Śmigus-Dyngus (also known as lany poniedziałek, meaning "Wet Monday") is a celebration held on Easter Monday in Poland. It is also observed by Polish diaspora communities, particularly among Polish Americans, who call it Dyngus Day. Similar celebrations are held in the Czech Republic and Slovakia (Oblévačka in Czech, Oblievačka in Slovak, both meaning "Watering") and in Hungary, where it is known as Vízbevető or "Water Plunge Monday"
4/1/2013 Dyngus Day: In Poland, Easter Monday is known as Wet Easter Monday, when boys try to drench girls with buckets of water, squirt guns, or whatever’s available. In some towns, they use twigs to switch the girls. The tradition has it that if a girl receives a drenching or switching, she will marry within the year. Click to read more.