The line comes from Dragon Ball Z Abridged, the fan-made parody series by TeamFourStar that revoiced Dragon Ball Z with new jokes and character traits. In that version Mr Popo is written as a calm but deeply unsettling figure, and deprarious is his invented word for something both depraved and precarious. Fans clipped the moment for its deadpan delivery, and it spread through Dragon Ball communities, reaction videos, and soundboards as shorthand for a threat that sounds polite but is not safe at all.