diamond in a billie goats ass Share definition Flag something that is very shiny or that sticks out , obvious More shiney than a Diamond in a Billie Goats Ass.. Like nice wheels on a crappy old car. diamond in a billie goats ass by Bob Ce February 25, 2007 0 0 Get merch Get the diamond in a billie goats ass mug. Buy Now — $32.95 See more merch