An ass/booty/butt/gluteus maximus that is so exceedingly prominent and voluptuous , that it is ridiculous. It brings a tear to the eye.
by skinnyc October 19, 2012
Otherwise the formal spelling of, redonkadonk, is derived from both redonkulous and badonkadonk; hence coupling verbal and visual absurdity together in order to portray something (emotionally and/or physically) unfathomably disturbing, amazing, or - in many cases - both.
Did I tell you about the time I saw Pat Robertson at a strip club getting a lapdance and screaming, "Hallelujah!!"? ...Yeah...Redonk-a-donk.
by C_Dizz February 28, 2007