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Professor Remus Lupin a teacher of Defence Against the Dark Arts at Hogwarts School of Witchcraft and Wizardry, used this charm to shoot a wad of gum at Peeves, the school's poltergeist, on 2 September, 1993.
"Waddiwasi" comes from two words. "Vadd" and "vas-y". "Vadd" is a Swedish word that can mean "wadding" and "vas-y" is French term that means "go ahead" or "Come on!" Together, they can roughly mean "The wad goes ahead."