At least some content in this article is derived from information featured in Harry Potter: Hogwarts Mystery. Spoilers will be present within the article.
On 2 September 1993, Remus Lupin, a teacher of Defence Against the Dark Arts at Hogwarts School of Witchcraft and Wizardry, used this jinx to shoot a wad of gum at Peeves, the school's poltergeist.
"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."
- Harry Potter and the Prisoner of Azkaban (First appearance)
- Harry Potter: Hogwarts Mystery