Backyard Sprinkler Share definition Flag The act of ejaculating across your partners back while having doggystyle sex. I was bangin this ho last night from behind and when I nutted I gave her the backyard sprinkler. Backyard Sprinkler by Bonedale Ben January 5, 2008 0 0 Get merch Get the Backyard Sprinkler mug. Buy Now — $32.95 See more merch