tree sitty Share definition Flag How a 10 year old says (Xbox) 360. Brat: Mommy, I want a tree sitty. Mother: No. Brat: TREE SITTY, TREE SITTY! I WANT A TREE SITTY! tree sitty by Ruklo June 19, 2006 0 0 Get merch Get the tree sitty mug. Buy Now — $32.95 See more merch