BESTEST-BESTFRIEND-IN-THE-WORLD Share definition Flag The way to describe a friend who means the world and more to you She is my BESTEST-BESTFRIEND-IN-THE-WORLD and I would trade nothing for her. BESTEST-BESTFRIEND-IN-THE-WORLD by YouWon'tIWillToo! July 19, 2010 0 0 Get merch Get the BESTEST-BESTFRIEND-IN-THE-WORLD mug. Buy Now — $32.95 See more merch