World's tallest waterslide under constructions, seen from the top. A photo of an under-construction water slide in Kansas City, Kan., with what looks to be a right-angle drop has social media users gawking and expressing fear. The Verruckt Meg-A-Blaster is being called the world's tallest and fastest water slide and the park where it is being built says it will shatter records set by another slide in Brazil. According to Guinness World Records, the world's tallest water slide is the Kilimanjaro in Barra do Piraí, which is 164 feet high. The slide at Kansas City's Schlitterbahn park will debut May 23, when the park opens for the season, according to the Kansas City Star. Verruckt is the German word for "insane." The park will not reveal the details on speed and height until the slide opens, but a photo being distributed on social media appears to show a slide that falls at nearly a right angle with the ground.