Dyngus Day (Śmigus-Dingus in Polish) is the name for Easter Monday. Traditionally a Polish tradition, Dyngus Day celebrates the end of Lent and the celebration of Easter. Across many US Polish communities, DYNGUS DAY has become a holiday to celebrate Polish-American culture, heritage and traditions. One of those traditions is boys throwing water onto girls they like and spanking them with ***** willows. Girls can also return the favor.