Japanese Mudslide Share definition Flag When a person sits on another's shoulders and precedes to poop down the back, creating a mud slide appearance "hey man did you hear about Johns Japanese mudslide?""yeah , he looked gross afterwards" Japanese Mudslide by petey pie99 January 13, 2010 0 0 Get merch Get the Japanese Mudslide mug. Buy Now — $32.95 See more merch