Derrbonk Share definition Flag yelling "derrbonk" is to insult someone as if they were to have special needs or mental retardation. "Derrbonk"! "Shagonk"! "dahdonk"! Derrbonk by Justin Martin November 25, 2006 0 0 Get merch Get the Derrbonk mug. Buy Now — $32.95 See more merch