vantonderism Share definition Flag A South African colloquialism referring to a (usually intoxicated) person falling/slipping on the floor near a swimming pool. Oh man, did you see Hannes last weekend? He totally had a vantonderism! vantonderism by maaaster_baiter June 13, 2017 0 0 Get merch Get the vantonderism mug. Buy Now — $32.95 See more merch